diff --git a/.travis.yml b/.travis.yml
index 8c57133..d1414c7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,7 +10,6 @@ jobs:
   - stage: lint
     script:
     - docker build -t sw3-travis .
-    - docker run -it --rm sw3-travis npm run ethlint
     - docker run -it --rm sw3-travis npm run solhint
   - stage: test
     script:
diff --git a/Dockerfile.abigen b/Dockerfile.abigen
index 5a51646..6468931 100644
--- a/Dockerfile.abigen
+++ b/Dockerfile.abigen
@@ -1,7 +1,7 @@
 FROM node:10.16.0-stretch as builder
 
 ARG GETH_VERSION="1.9.7-a718daa6"
-ARG SOLIDITY_VERSION="0.5.13"
+ARG SOLIDITY_VERSION="0.5.15"
 
 RUN wget -q "https://github.com/ethereum/solidity/releases/download/v$SOLIDITY_VERSION/solc-static-linux" \
   && chmod +x solc-static-linux \
diff --git a/contracts/ERC20SimpleSwap.sol b/contracts/ERC20SimpleSwap.sol
index 6c3884c..f8019ae 100644
--- a/contracts/ERC20SimpleSwap.sol
+++ b/contracts/ERC20SimpleSwap.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.11;
+pragma solidity =0.5.15;
 import "@openzeppelin/contracts/math/SafeMath.sol";
 import "@openzeppelin/contracts/math/Math.sol";
 import "@openzeppelin/contracts/cryptography/ECDSA.sol";
diff --git a/contracts/SimpleSwapFactory.sol b/contracts/SimpleSwapFactory.sol
index 8c54b8b..21ca84f 100644
--- a/contracts/SimpleSwapFactory.sol
+++ b/contracts/SimpleSwapFactory.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.11;
+pragma solidity =0.5.15;
 import "./ERC20SimpleSwap.sol";
 
 /**
diff --git a/package-lock.json b/package-lock.json
index 9b8907e..108ff6d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -24,13 +24,30 @@
         "js-tokens": "^4.0.0"
       }
     },
-    "@babel/runtime": {
-      "version": "7.5.1",
-      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.5.1.tgz",
-      "integrity": "sha512-g+hmPKs16iewFSmW57NkH9xpPkuYD1RV3UE2BCkXx9j+nhhRb9hsiSxPmEa67j35IecTQdn4iyMtHMbt5VoREg==",
+    "@nodelib/fs.scandir": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.3.tgz",
+      "integrity": "sha512-eGmwYQn3gxo4r7jdQnkrrN6bY478C3P+a/y72IJukF8LjB6ZHeB3c+Ehacj3sYeSmUXGlnA67/PmbM9CVwL7Dw==",
       "dev": true,
       "requires": {
-        "regenerator-runtime": "^0.13.2"
+        "@nodelib/fs.stat": "2.0.3",
+        "run-parallel": "^1.1.9"
+      }
+    },
+    "@nodelib/fs.stat": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.stat/-/fs.stat-2.0.3.tgz",
+      "integrity": "sha512-bQBFruR2TAwoevBEd/NWMoAAtNGzTRgdrqnYCc7dhzfoNvqPzLyqlEQnzZ3kVnNrSp25iyxE00/3h2fqGAGArA==",
+      "dev": true
+    },
+    "@nodelib/fs.walk": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.walk/-/fs.walk-1.2.4.tgz",
+      "integrity": "sha512-1V9XOY4rDW0rehzbrcqAmHnz8e7SKvX27gh8Gt2WgB0+pdzdiLV83p72kZPU+jvMbS1qU5mauP2iOvO8rhmurQ==",
+      "dev": true,
+      "requires": {
+        "@nodelib/fs.scandir": "2.1.3",
+        "fastq": "^1.6.0"
       }
     },
     "@openzeppelin/contracts": {
@@ -136,6 +153,12 @@
         }
       }
     },
+    "@truffle/error": {
+      "version": "0.0.7",
+      "resolved": "https://registry.npmjs.org/@truffle/error/-/error-0.0.7.tgz",
+      "integrity": "sha512-UIfVKsXSXocKnn5+RNklUXNoGd/JVj7V8KmC48TQzmjU33HQI86PX0JDS7SpHMHasI3w9X//1q7Lu7nZtj3Zzg==",
+      "dev": true
+    },
     "@truffle/interface-adapter": {
       "version": "0.3.1",
       "resolved": "https://registry.npmjs.org/@truffle/interface-adapter/-/interface-adapter-0.3.1.tgz",
@@ -156,21 +179,103 @@
         }
       }
     },
+    "@truffle/provider": {
+      "version": "0.1.19",
+      "resolved": "https://registry.npmjs.org/@truffle/provider/-/provider-0.1.19.tgz",
+      "integrity": "sha512-ke8iQmzW4Y99+8iff8xQcc+mCNU4AkwtaZ/iSpmVD8qpLytw8/DSNCm0RiEz9/+I93Q1zqI4Jnij/rXnkS2Njw==",
+      "dev": true,
+      "requires": {
+        "@truffle/error": "^0.0.7",
+        "@truffle/interface-adapter": "^0.3.0",
+        "web3": "1.2.1"
+      }
+    },
     "@types/bn.js": {
-      "version": "4.11.5",
-      "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-4.11.5.tgz",
-      "integrity": "sha512-AEAZcIZga0JgVMHNtl1CprA/hXX7/wPt79AgR4XqaDt7jyj3QWYw6LPoOiznPtugDmlubUnAahMs2PFxGcQrng==",
+      "version": "4.11.6",
+      "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-4.11.6.tgz",
+      "integrity": "sha512-pqr857jrp2kPuO9uRjZ3PwnJTjoQy+fcdxvBTvHm6dkmEL9q+hDD/2j/0ELOBPtPnS8LjCX0gI9nbl8lVkadpg==",
+      "dev": true,
+      "requires": {
+        "@types/node": "*"
+      }
+    },
+    "@types/events": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/@types/events/-/events-3.0.0.tgz",
+      "integrity": "sha512-EaObqwIvayI5a8dCzhFrjKzVwKLxjoG9T6Ppd5CEo07LRKfQ8Yokw54r5+Wq7FaBQ+yXRvQAYPrHwya1/UFt9g==",
+      "dev": true
+    },
+    "@types/glob": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/@types/glob/-/glob-7.1.1.tgz",
+      "integrity": "sha512-1Bh06cbWJUHMC97acuD6UMG29nMt0Aqz1vF3guLfG+kHHJhy3AyohZFFxYk2f7Q1SQIrNwvncxAE0N/9s70F2w==",
       "dev": true,
       "requires": {
+        "@types/events": "*",
+        "@types/minimatch": "*",
         "@types/node": "*"
       }
     },
+    "@types/minimatch": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/@types/minimatch/-/minimatch-3.0.3.tgz",
+      "integrity": "sha512-tHq6qdbT9U1IRSGf14CL0pUlULksvY9OZ+5eEgl1N7t+OA3tGvNpxJCzuKQlsNgCVwbAs670L1vcVQi8j9HjnA==",
+      "dev": true
+    },
     "@types/node": {
       "version": "10.14.12",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-10.14.12.tgz",
       "integrity": "sha512-QcAKpaO6nhHLlxWBvpc4WeLrTvPqlHOvaj0s5GriKkA1zq+bsFBPpfYCvQhLqLgYlIko8A9YrPdaMHCo5mBcpg==",
       "dev": true
     },
+    "@web3-js/scrypt-shim": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/@web3-js/scrypt-shim/-/scrypt-shim-0.1.0.tgz",
+      "integrity": "sha512-ZtZeWCc/s0nMcdx/+rZwY1EcuRdemOK9ag21ty9UsHkFxsNb/AaoucUz0iPuyGe0Ku+PFuRmWZG7Z7462p9xPw==",
+      "dev": true,
+      "requires": {
+        "scryptsy": "^2.1.0",
+        "semver": "^6.3.0"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "6.3.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
+          "dev": true
+        }
+      }
+    },
+    "@web3-js/websocket": {
+      "version": "1.0.30",
+      "resolved": "https://registry.npmjs.org/@web3-js/websocket/-/websocket-1.0.30.tgz",
+      "integrity": "sha512-fDwrD47MiDrzcJdSeTLF75aCcxVVt8B1N74rA+vh2XCAvFy4tEWJjtnUtj2QG7/zlQ6g9cQ88bZFBxwd9/FmtA==",
+      "dev": true,
+      "requires": {
+        "debug": "^2.2.0",
+        "es5-ext": "^0.10.50",
+        "nan": "^2.14.0",
+        "typedarray-to-buffer": "^3.1.5",
+        "yaeti": "^0.0.6"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "2.6.9",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "dev": true,
+          "requires": {
+            "ms": "2.0.0"
+          }
+        },
+        "nan": {
+          "version": "2.14.0",
+          "resolved": "https://registry.npmjs.org/nan/-/nan-2.14.0.tgz",
+          "integrity": "sha512-INOFj37C7k3AfaNTtX8RhsTw7qRy7eLET14cROi9+5HAVbbHuIWUHEauBv5qT4Av2tWasiTY1Jw6puUNqRJXQg==",
+          "dev": true
+        }
+      }
+    },
     "abbrev": {
       "version": "1.0.9",
       "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz",
@@ -188,9 +293,9 @@
       }
     },
     "acorn": {
-      "version": "6.2.1",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.2.1.tgz",
-      "integrity": "sha512-JD0xT5FCRDNyjDda3Lrg/IxFscp9q4tiYtxE1/nOzlKCk7hIRuYjhq1kCNkbPjMRMZuFq20HNQn1I9k8Oj0E+Q==",
+      "version": "6.4.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.1.tgz",
+      "integrity": "sha512-ZVA9k326Nwrj3Cj9jlh3wGFutC2ZornPNARZwsNYqQYgN0EsV2d53w5RN/co65Ohn4sUAUtb1rSUAOD6XN9idA==",
       "dev": true
     },
     "acorn-jsx": {
@@ -199,6 +304,12 @@
       "integrity": "sha512-HJ7CfNHrfJLlNTzIEUTj43LNWGkqpRLxm3YjAlcD0ACydk9XynzYsCBHxut+iqt+1aBXkx9UP/w/ZqMr13XIzg==",
       "dev": true
     },
+    "address": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/address/-/address-1.1.2.tgz",
+      "integrity": "sha512-aT6camzM4xEA54YVJYSqxz1kv4IHnQZRtThJJHhUMRExaU5spC7jX5ugSwTaTgJliIgs4VhZOk7htClvQ/LmRA==",
+      "dev": true
+    },
     "aes-js": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/aes-js/-/aes-js-3.0.0.tgz",
@@ -236,15 +347,6 @@
       "integrity": "sha512-cBhpre4ma+U0T1oM5fXg7Dy1Jw7zzwv7lt/GoCpr+hDQJoYnKVPLL4dCvSEFMmQurOQvSrwT7SL/DAlhBI97RQ==",
       "dev": true
     },
-    "ansi-gray": {
-      "version": "0.1.1",
-      "resolved": "https://registry.npmjs.org/ansi-gray/-/ansi-gray-0.1.1.tgz",
-      "integrity": "sha1-KWLPVOyXksSFEKPetSRDaGHvclE=",
-      "dev": true,
-      "requires": {
-        "ansi-wrap": "0.1.0"
-      }
-    },
     "ansi-regex": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
@@ -260,12 +362,6 @@
         "color-convert": "^1.9.0"
       }
     },
-    "ansi-wrap": {
-      "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/ansi-wrap/-/ansi-wrap-0.1.0.tgz",
-      "integrity": "sha1-qCJQ3bABXponyoLoLqYDu/pF768=",
-      "dev": true
-    },
     "antlr4": {
       "version": "4.7.1",
       "resolved": "https://registry.npmjs.org/antlr4/-/antlr4-4.7.1.tgz",
@@ -278,37 +374,12 @@
       "integrity": "sha1-q8av7tzqUugJzcA3au0845Y10X8=",
       "dev": true
     },
-    "anymatch": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-2.0.0.tgz",
-      "integrity": "sha512-5teOsQWABXHHBFP9y3skS5P3d/WfWXpv3FUpy+LorMrNYaT9pI4oLMQX7jzQ2KklNpGpWHzdCXTDT2Y3XGlZBw==",
-      "dev": true,
-      "requires": {
-        "micromatch": "^3.1.4",
-        "normalize-path": "^2.1.1"
-      }
-    },
     "app-module-path": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/app-module-path/-/app-module-path-2.2.0.tgz",
       "integrity": "sha1-ZBqlXft9am8KgUHEucCqULbCTdU=",
       "dev": true
     },
-    "append-buffer": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/append-buffer/-/append-buffer-1.0.2.tgz",
-      "integrity": "sha1-2CIM9GYIFSXv6lBhTz3mUU36WPE=",
-      "dev": true,
-      "requires": {
-        "buffer-equal": "^1.0.0"
-      }
-    },
-    "archy": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/archy/-/archy-1.0.0.tgz",
-      "integrity": "sha1-+cjBN1fMHde8N5rHeyxipcKGjEA=",
-      "dev": true
-    },
     "argparse": {
       "version": "1.0.10",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
@@ -324,108 +395,30 @@
       "integrity": "sha1-1kYQdP6/7HHn4VI1dhoyml3HxSA=",
       "dev": true
     },
-    "arr-filter": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/arr-filter/-/arr-filter-1.1.2.tgz",
-      "integrity": "sha1-Q/3d0JHo7xGqTEXZzcGOLf8XEe4=",
-      "dev": true,
-      "requires": {
-        "make-iterator": "^1.0.0"
-      }
-    },
     "arr-flatten": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/arr-flatten/-/arr-flatten-1.1.0.tgz",
       "integrity": "sha512-L3hKV5R/p5o81R7O02IGnwpDmkp6E982XhtbuwSe3O4qOtMMMtodicASA1Cny2U+aCXcNpml+m4dPsvsJ3jatg==",
       "dev": true
     },
-    "arr-map": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/arr-map/-/arr-map-2.0.2.tgz",
-      "integrity": "sha1-Onc0X/wc814qkYJWAfnljy4kysQ=",
-      "dev": true,
-      "requires": {
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-      }
-    },
     "arr-union": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/arr-union/-/arr-union-3.1.0.tgz",
       "integrity": "sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ=",
       "dev": true
     },
-    "array-each": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/array-each/-/array-each-1.0.1.tgz",
-      "integrity": "sha1-p5SvDAWrF1KEbudTofIRoFugxE8=",
-      "dev": true
-    },
     "array-flatten": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
       "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI=",
       "dev": true
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-    "array-initial": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/array-initial/-/array-initial-1.1.0.tgz",
-      "integrity": "sha1-L6dLJnOTccOUe9enrcc74zSz15U=",
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-        "array-slice": "^1.0.0",
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-      }
-    },
-    "array-last": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/array-last/-/array-last-1.3.0.tgz",
-      "integrity": "sha512-eOCut5rXlI6aCOS7Z7kCplKRKyiFQ6dHFBem4PwlwKeNFk2/XxTrhRh5T9PyaEWGy/NHTZWbY+nsZlNFJu9rYg==",
-      "dev": true,
-      "requires": {
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-          "version": "4.0.0",
-          "resolved": "https://registry.npmjs.org/is-number/-/is-number-4.0.0.tgz",
-          "integrity": "sha512-rSklcAIlf1OmFdyAqbnWTLVelsQ58uvZ66S/ZyawjWqIviTWCjg2PzVGw8WUA+nNuPTqb4wgA+NszrJ+08LlgQ==",
-          "dev": true
-        }
-      }
-    },
-    "array-slice": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/array-slice/-/array-slice-1.1.0.tgz",
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+    "array-union": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/array-union/-/array-union-2.1.0.tgz",
+      "integrity": "sha512-HGyxoOTYUyCM6stUe6EJgnd4EoewAI7zMdfqO+kGjnlZmBDz/cR5pf8r/cR4Wq60sL/p0IkcjUEEPwS3GFrIyw==",
       "dev": true
     },
-    "array-sort": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/array-sort/-/array-sort-1.0.0.tgz",
-      "integrity": "sha512-ihLeJkonmdiAsD7vpgN3CRcx2J2S0TiYW+IS/5zHBI7mKUq3ySvBdzzBfD236ubDBQFiiyG3SWCPc+msQ9KoYg==",
-      "dev": true,
-      "requires": {
-        "default-compare": "^1.0.0",
-        "get-value": "^2.0.6",
-        "kind-of": "^5.0.2"
-      },
-      "dependencies": {
-        "kind-of": {
-          "version": "5.1.0",
-          "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-5.1.0.tgz",
-          "integrity": "sha512-NGEErnH6F2vUuXDh+OlbcKW7/wOcfdRHaZ7VWtqCztfHri/++YKmP51OdWeGPuqCOba6kk2OTe5d02VmTB80Pw==",
-          "dev": true
-        }
-      }
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     "array-unique": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.3.2.tgz",
@@ -482,18 +475,6 @@
       "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
       "dev": true
     },
-    "async-done": {
-      "version": "1.3.2",
-      "resolved": "https://registry.npmjs.org/async-done/-/async-done-1.3.2.tgz",
-      "integrity": "sha512-uYkTP8dw2og1tu1nmza1n1CMW0qb8gWWlwqMmLb7MhBVs4BXrFziT6HXUd+/RlRA/i4H9AkofYloUbs1fwMqlw==",
-      "dev": true,
-      "requires": {
-        "end-of-stream": "^1.1.0",
-        "once": "^1.3.2",
-        "process-nextick-args": "^2.0.0",
-        "stream-exhaust": "^1.0.1"
-      }
-    },
     "async-each": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.3.tgz",
@@ -506,15 +487,6 @@
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       "dev": true
     },
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diff --git a/package.json b/package.json
index ddae271..7b11b35 100644
--- a/package.json
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     "@openzeppelin/contracts": "^2.4.0"
   },
   "devDependencies": {
+    "@openzeppelin/test-helpers": "^0.5.3",
     "bn-chai": "^1.0.1",
     "chai": "^4.2.0",
     "ethereumjs-abi": "^0.6.7",
-    "ethlint": "^1.2.4",
-    "@openzeppelin/test-helpers": "^0.5.3",
     "solhint": "^2.1.2",
-    "solidity-coverage": "^0.6.0-beta.5",
+    "solidity-coverage": "^0.7.2",
     "truffle": "^5.0.24"
   },
   "scripts": {
     "test": "truffle test",
     "abigen": "./abigen/gen.sh ERC20SimpleSwap SimpleSwapFactory",
-    "solhint": "solhint contracts/ERC20SimpleSwap.sol contracts/SimpleSwapFactory.sol",
-    "ethlint": "solium -d contracts",
-    "coverage": "solidity-coverage"
+    "solhint": "solhint contracts/ERC20SimpleSwap.sol contracts/SimpleSwapFactory.sol",    
+    "coverage": "truffle run coverage"
   },
   "keywords": [],
   "author": "",
diff --git a/truffle-config.js b/truffle-config.js
index b23d444..2255c81 100644
--- a/truffle-config.js
+++ b/truffle-config.js
@@ -69,11 +69,12 @@ module.exports = {
   mocha: {
     // timeout: 100000
   },
+  plugins: ["solidity-coverage"],
 
   // Configure your compilers
   compilers: {
     solc: {
-      version: "0.5.13",    // Fetch exact version from solc-bin (default: truffle's version)
+      version: "0.5.15",    // Fetch exact version from solc-bin (default: truffle's version)
       settings: {          // See the solidity docs for advice about optimization and evmVersion
        optimizer: {
          enabled: true,