dependency updates (#139)

package.json

@@ -11,19 +11,19 @@
     "url": "https://github.com/ethersphere/swap-swear-and-swindle.git"
   },
   "dependencies": {
-    "@openzeppelin/contracts": "^3.4.1-solc-0.7-2"
+    "@openzeppelin/contracts": "^3.4.2-solc-0.7-2"
   },
   "devDependencies": {
-    "@nomiclabs/hardhat-truffle5": "^2.0.0",
+    "@nomiclabs/hardhat-truffle5": "^2.0.2",
     "@nomiclabs/hardhat-web3": "^2.0.0",
-    "@openzeppelin/test-helpers": "^0.5.6",
+    "@openzeppelin/test-helpers": "^0.5.15",
     "bn-chai": "^1.0.1",
     "chai": "^4.2.0",
     "ethereumjs-abi": "^0.6.8",
-    "hardhat": "^2.1.1",
-    "solhint": "^3.2.0",
-    "solidity-coverage": "^0.7.16",
-    "web3": "^1.3.4"
+    "hardhat": "^2.6.8",
+    "solhint": "^3.3.6",
+    "solidity-coverage": "^0.7.17",
+    "web3": "^1.6.1"
   },
   "scripts": {
     "compile": "hardhat compile",