diff --git a/.eslintignore b/.eslintignore
deleted file mode 100644
index 1521c8b..0000000
--- a/.eslintignore
+++ /dev/null
@@ -1 +0,0 @@
-dist
diff --git a/package.json b/package.json
index f626cd5..fed5807 100644
--- a/package.json
+++ b/package.json
@@ -30,16 +30,13 @@
     "babel-eslint": "^7.1.1",
     "babel-preset-env": "^1.2.2",
     "babel-preset-stage-0": "^6.22.0",
-    "eslint": "^3.18.0",
-    "eslint-config-standard": "^7.1.0",
-    "eslint-plugin-promise": "^3.5.0",
-    "eslint-plugin-standard": "^2.1.1",
     "rollup": "^0.41.6",
     "rollup-plugin-babel": "^2.7.1",
-    "rollup-watch": "^3.2.2"
+    "rollup-watch": "^3.2.2",
+    "standard": "^9.0.2"
   },
   "scripts": {
-    "lint": "eslint .",
+    "lint": "standard",
     "prebuild": "npm run lint",
     "build": "rollup --config",
     "build:watch": "npm run build -- --watch",
@@ -69,10 +66,10 @@
       "stage-0"
     ]
   },
-  "eslintConfig": {
+  "standard": {
     "parser": "babel-eslint",
-    "extends": [
-      "standard"
+    "ignore": [
+      "dist/**"
     ]
   }
 }
diff --git a/yarn.lock b/yarn.lock
index 5aa78bc..cb48821 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -55,6 +55,13 @@ array-uniq@^1.0.1:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/array-uniq/-/array-uniq-1.0.3.tgz#af6ac877a25cc7f74e058894753858dfdb24fdb6"
 
+array.prototype.find@^2.0.1:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/array.prototype.find/-/array.prototype.find-2.0.3.tgz#08c3ec33e32ec4bab362a2958e686ae92f59271d"
+  dependencies:
+    define-properties "^1.1.2"
+    es-abstract "^1.7.0"
+
 arrify@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/arrify/-/arrify-1.0.1.tgz#898508da2226f380df904728456849c1501a4b0d"
@@ -776,6 +783,10 @@ d@1:
   dependencies:
     es5-ext "^0.10.9"
 
+debug-log@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/debug-log/-/debug-log-1.0.1.tgz#2307632d4c04382b8df8a32f70b895046d52745f"
+
 debug@^2.1.1, debug@^2.2.0:
   version "2.6.3"
   resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.3.tgz#0f7eb8c30965ec08c72accfa0130c8b79984141d"
@@ -786,6 +797,24 @@ deep-is@~0.1.3:
   version "0.1.3"
   resolved "https://registry.yarnpkg.com/deep-is/-/deep-is-0.1.3.tgz#b369d6fb5dbc13eecf524f91b070feedc357cf34"
 
+define-properties@^1.1.2:
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/define-properties/-/define-properties-1.1.2.tgz#83a73f2fea569898fb737193c8f873caf6d45c94"
+  dependencies:
+    foreach "^2.0.5"
+    object-keys "^1.0.8"
+
+deglob@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/deglob/-/deglob-2.1.0.tgz#4d44abe16ef32c779b4972bd141a80325029a14a"
+  dependencies:
+    find-root "^1.0.0"
+    glob "^7.0.5"
+    ignore "^3.0.9"
+    pkg-config "^1.1.0"
+    run-parallel "^1.1.2"
+    uniq "^1.0.1"
+
 del@^2.0.2:
   version "2.2.2"
   resolved "https://registry.yarnpkg.com/del/-/del-2.2.2.tgz#c12c981d067846c84bcaf862cff930d907ffd1a8"
@@ -804,6 +833,13 @@ detect-indent@^4.0.0:
   dependencies:
     repeating "^2.0.0"
 
+doctrine@^1.2.2:
+  version "1.5.0"
+  resolved "https://registry.yarnpkg.com/doctrine/-/doctrine-1.5.0.tgz#379dce730f6166f76cefa4e6707a159b02c5a6fa"
+  dependencies:
+    esutils "^2.0.2"
+    isarray "^1.0.0"
+
 doctrine@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/doctrine/-/doctrine-2.0.0.tgz#c73d8d2909d22291e1a007a395804da8b665fe63"
@@ -815,6 +851,29 @@ electron-to-chromium@^1.2.5, electron-to-chromium@^1.2.6:
   version "1.2.7"
   resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.2.7.tgz#4f748061407e478c76256d04496972b71f647407"
 
+error-ex@^1.2.0:
+  version "1.3.1"
+  resolved "https://registry.yarnpkg.com/error-ex/-/error-ex-1.3.1.tgz#f855a86ce61adc4e8621c3cda21e7a7612c3a8dc"
+  dependencies:
+    is-arrayish "^0.2.1"
+
+es-abstract@^1.7.0:
+  version "1.7.0"
+  resolved "https://registry.yarnpkg.com/es-abstract/-/es-abstract-1.7.0.tgz#dfade774e01bfcd97f96180298c449c8623fb94c"
+  dependencies:
+    es-to-primitive "^1.1.1"
+    function-bind "^1.1.0"
+    is-callable "^1.1.3"
+    is-regex "^1.0.3"
+
+es-to-primitive@^1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/es-to-primitive/-/es-to-primitive-1.1.1.tgz#45355248a88979034b6792e19bb81f2b7975dd0d"
+  dependencies:
+    is-callable "^1.1.1"
+    is-date-object "^1.0.1"
+    is-symbol "^1.0.1"
+
 es5-ext@^0.10.14, es5-ext@^0.10.9, es5-ext@~0.10.14:
   version "0.10.14"
   resolved "https://registry.yarnpkg.com/es5-ext/-/es5-ext-0.10.14.tgz#625bc9ab9cac0f6fb9dc271525823d1800b3d360"
@@ -880,19 +939,31 @@ escope@^3.6.0:
     esrecurse "^4.1.0"
     estraverse "^4.1.1"
 
-eslint-config-standard@^7.1.0:
+eslint-config-standard-jsx@3.3.0:
+  version "3.3.0"
+  resolved "https://registry.yarnpkg.com/eslint-config-standard-jsx/-/eslint-config-standard-jsx-3.3.0.tgz#cab0801a15a360bf63facb97ab22fbdd88d8a5e0"
+
+eslint-config-standard@7.1.0:
   version "7.1.0"
   resolved "https://registry.yarnpkg.com/eslint-config-standard/-/eslint-config-standard-7.1.0.tgz#47e769ea0739f5b2d5693b1a501c21c9650fafcf"
 
-eslint-plugin-promise@^3.5.0:
-  version "3.5.0"
-  resolved "https://registry.yarnpkg.com/eslint-plugin-promise/-/eslint-plugin-promise-3.5.0.tgz#78fbb6ffe047201627569e85a6c5373af2a68fca"
+eslint-plugin-promise@~3.4.0:
+  version "3.4.2"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-promise/-/eslint-plugin-promise-3.4.2.tgz#1be2793eafe2d18b5b123b8136c269f804fe7122"
 
-eslint-plugin-standard@^2.1.1:
-  version "2.1.1"
-  resolved "https://registry.yarnpkg.com/eslint-plugin-standard/-/eslint-plugin-standard-2.1.1.tgz#97960b1537e1718bb633877d0a650050effff3b0"
+eslint-plugin-react@~6.9.0:
+  version "6.9.0"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-react/-/eslint-plugin-react-6.9.0.tgz#54c2e9906b76f9d10142030bdc34e9d6840a0bb2"
+  dependencies:
+    array.prototype.find "^2.0.1"
+    doctrine "^1.2.2"
+    jsx-ast-utils "^1.3.4"
+
+eslint-plugin-standard@~2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-standard/-/eslint-plugin-standard-2.0.1.tgz#3589699ff9c917f2c25f76a916687f641c369ff3"
 
-eslint@^3.18.0:
+eslint@~3.18.0:
   version "3.18.0"
   resolved "https://registry.yarnpkg.com/eslint/-/eslint-3.18.0.tgz#647e985c4ae71502d20ac62c109f66d5104c8a4b"
   dependencies:
@@ -1001,6 +1072,16 @@ file-entry-cache@^2.0.0:
     flat-cache "^1.2.1"
     object-assign "^4.0.1"
 
+find-root@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/find-root/-/find-root-1.0.0.tgz#962ff211aab25c6520feeeb8d6287f8f6e95807a"
+
+find-up@^2.0.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/find-up/-/find-up-2.1.0.tgz#45d1b7e506c717ddd482775a2b77920a3c0c57a7"
+  dependencies:
+    locate-path "^2.0.0"
+
 flat-cache@^1.2.1:
   version "1.2.2"
   resolved "https://registry.yarnpkg.com/flat-cache/-/flat-cache-1.2.2.tgz#fa86714e72c21db88601761ecf2f555d1abc6b96"
@@ -1010,6 +1091,10 @@ flat-cache@^1.2.1:
     graceful-fs "^4.1.2"
     write "^0.2.1"
 
+foreach@^2.0.5:
+  version "2.0.5"
+  resolved "https://registry.yarnpkg.com/foreach/-/foreach-2.0.5.tgz#0bee005018aeb260d0a3af3ae658dd0136ec1b99"
+
 formidable@^1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/formidable/-/formidable-1.1.1.tgz#96b8886f7c3c3508b932d6bd70c4d3a88f35f1a9"
@@ -1018,6 +1103,10 @@ fs.realpath@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/fs.realpath/-/fs.realpath-1.0.0.tgz#1504ad2523158caa40db4a2787cb01411994ea4f"
 
+function-bind@^1.0.2, function-bind@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/function-bind/-/function-bind-1.1.0.tgz#16176714c801798e4e8f2cf7f7529467bb4a5771"
+
 generate-function@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/generate-function/-/generate-function-2.0.0.tgz#6858fe7c0969b7d4e9093337647ac79f60dfbe74"
@@ -1028,6 +1117,10 @@ generate-object-property@^1.1.0:
   dependencies:
     is-property "^1.0.0"
 
+get-stdin@^5.0.1:
+  version "5.0.1"
+  resolved "https://registry.yarnpkg.com/get-stdin/-/get-stdin-5.0.1.tgz#122e161591e21ff4c52530305693f20e6393a398"
+
 glob@^7.0.0, glob@^7.0.3, glob@^7.0.5:
   version "7.1.1"
   resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.1.tgz#805211df04faaf1c63a3600306cdf5ade50b2ec8"
@@ -1064,6 +1157,12 @@ has-ansi@^2.0.0:
   dependencies:
     ansi-regex "^2.0.0"
 
+has@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/has/-/has-1.0.1.tgz#8461733f538b0837c9361e39a9ab9e9704dc2f28"
+  dependencies:
+    function-bind "^1.0.2"
+
 home-or-tmp@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/home-or-tmp/-/home-or-tmp-2.0.0.tgz#e36c3f2d2cae7d746a857e38d18d5f32a7882db8"
@@ -1071,7 +1170,7 @@ home-or-tmp@^2.0.0:
     os-homedir "^1.0.0"
     os-tmpdir "^1.0.1"
 
-ignore@^3.2.0:
+ignore@^3.0.9, ignore@^3.2.0:
   version "3.2.6"
   resolved "https://registry.yarnpkg.com/ignore/-/ignore-3.2.6.tgz#26e8da0644be0bb4cb39516f6c79f0e0f4ffe48c"
 
@@ -1118,6 +1217,18 @@ invariant@^2.2.0, invariant@^2.2.2:
   dependencies:
     loose-envify "^1.0.0"
 
+is-arrayish@^0.2.1:
+  version "0.2.1"
+  resolved "https://registry.yarnpkg.com/is-arrayish/-/is-arrayish-0.2.1.tgz#77c99840527aa8ecb1a8ba697b80645a7a926a9d"
+
+is-callable@^1.1.1, is-callable@^1.1.3:
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/is-callable/-/is-callable-1.1.3.tgz#86eb75392805ddc33af71c92a0eedf74ee7604b2"
+
+is-date-object@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/is-date-object/-/is-date-object-1.0.1.tgz#9aa20eb6aeebbff77fbd33e74ca01b33581d3a16"
+
 is-finite@^1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/is-finite/-/is-finite-1.0.2.tgz#cc6677695602be550ef11e8b4aa6305342b6d0aa"
@@ -1163,12 +1274,22 @@ is-property@^1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/is-property/-/is-property-1.0.2.tgz#57fe1c4e48474edd65b09911f26b1cd4095dda84"
 
+is-regex@^1.0.3:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/is-regex/-/is-regex-1.0.4.tgz#5517489b547091b0930e095654ced25ee97e9491"
+  dependencies:
+    has "^1.0.1"
+
 is-resolvable@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/is-resolvable/-/is-resolvable-1.0.0.tgz#8df57c61ea2e3c501408d100fb013cf8d6e0cc62"
   dependencies:
     tryit "^1.0.1"
 
+is-symbol@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/is-symbol/-/is-symbol-1.0.1.tgz#3cc59f00025194b6ab2e38dbae6689256b660572"
+
 isarray@^1.0.0, isarray@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/isarray/-/isarray-1.0.0.tgz#bb935d48582cba168c06834957a54a3e07124f11"
@@ -1210,6 +1331,12 @@ jsonpointer@^4.0.0:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/jsonpointer/-/jsonpointer-4.0.1.tgz#4fd92cb34e0e9db3c89c8622ecf51f9b978c6cb9"
 
+jsx-ast-utils@^1.3.4:
+  version "1.4.0"
+  resolved "https://registry.yarnpkg.com/jsx-ast-utils/-/jsx-ast-utils-1.4.0.tgz#5afe38868f56bc8cc7aeaef0100ba8c75bd12591"
+  dependencies:
+    object-assign "^4.1.0"
+
 levn@^0.3.0, levn@~0.3.0:
   version "0.3.0"
   resolved "https://registry.yarnpkg.com/levn/-/levn-0.3.0.tgz#3b09924edf9f083c0490fdd4c0bc4421e04764ee"
@@ -1217,6 +1344,22 @@ levn@^0.3.0, levn@~0.3.0:
     prelude-ls "~1.1.2"
     type-check "~0.3.2"
 
+load-json-file@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/load-json-file/-/load-json-file-2.0.0.tgz#7947e42149af80d696cbf797bcaabcfe1fe29ca8"
+  dependencies:
+    graceful-fs "^4.1.2"
+    parse-json "^2.2.0"
+    pify "^2.0.0"
+    strip-bom "^3.0.0"
+
+locate-path@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/locate-path/-/locate-path-2.0.0.tgz#2b568b265eec944c6d9c0de9c3dbbbca0354cd8e"
+  dependencies:
+    p-locate "^2.0.0"
+    path-exists "^3.0.0"
+
 lodash.pickby@^4.6.0:
   version "4.6.0"
   resolved "https://registry.yarnpkg.com/lodash.pickby/-/lodash.pickby-4.6.0.tgz#7dea21d8c18d7703a27c704c15d3b84a67e33aff"
@@ -1241,6 +1384,10 @@ minimist@0.0.8:
   version "0.0.8"
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
 
+minimist@^1.1.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
+
 mkdirp@^0.5.0, mkdirp@^0.5.1:
   version "0.5.1"
   resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-0.5.1.tgz#30057438eac6cf7f8c4767f38648d6697d75c903"
@@ -1267,6 +1414,10 @@ object-assign@^4.0.1, object-assign@^4.1.0:
   version "4.1.1"
   resolved "https://registry.yarnpkg.com/object-assign/-/object-assign-4.1.1.tgz#2109adc7965887cfc05cbbd442cac8bfbb360863"
 
+object-keys@^1.0.8:
+  version "1.0.11"
+  resolved "https://registry.yarnpkg.com/object-keys/-/object-keys-1.0.11.tgz#c54601778ad560f1142ce0e01bcca8b56d13426d"
+
 object-path@^0.11.4:
   version "0.11.4"
   resolved "https://registry.yarnpkg.com/object-path/-/object-path-0.11.4.tgz#370ae752fbf37de3ea70a861c23bba8915691949"
@@ -1300,6 +1451,26 @@ os-tmpdir@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/os-tmpdir/-/os-tmpdir-1.0.2.tgz#bbe67406c79aa85c5cfec766fe5734555dfa1274"
 
+p-limit@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/p-limit/-/p-limit-1.1.0.tgz#b07ff2d9a5d88bec806035895a2bab66a27988bc"
+
+p-locate@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/p-locate/-/p-locate-2.0.0.tgz#20a0103b222a70c8fd39cc2e580680f3dde5ec43"
+  dependencies:
+    p-limit "^1.1.0"
+
+parse-json@^2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/parse-json/-/parse-json-2.2.0.tgz#f480f40434ef80741f8469099f8dea18f55a4dc9"
+  dependencies:
+    error-ex "^1.2.0"
+
+path-exists@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/path-exists/-/path-exists-3.0.0.tgz#ce0ebeaa5f78cb18925ea7d810d7b59b010fd515"
+
 path-is-absolute@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/path-is-absolute/-/path-is-absolute-1.0.1.tgz#174b9268735534ffbc7ace6bf53a5a9e1b5c5f5f"
@@ -1326,6 +1497,21 @@ pinkie@^2.0.0:
   version "2.0.4"
   resolved "https://registry.yarnpkg.com/pinkie/-/pinkie-2.0.4.tgz#72556b80cfa0d48a974e80e77248e80ed4f7f870"
 
+pkg-conf@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/pkg-conf/-/pkg-conf-2.0.0.tgz#071c87650403bccfb9c627f58751bfe47c067279"
+  dependencies:
+    find-up "^2.0.0"
+    load-json-file "^2.0.0"
+
+pkg-config@^1.1.0:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/pkg-config/-/pkg-config-1.1.1.tgz#557ef22d73da3c8837107766c52eadabde298fe4"
+  dependencies:
+    debug-log "^1.0.0"
+    find-root "^1.0.0"
+    xtend "^4.0.1"
+
 pluralize@^1.2.1:
   version "1.2.1"
   resolved "https://registry.yarnpkg.com/pluralize/-/pluralize-1.2.1.tgz#d1a21483fd22bb41e58a12fa3421823140897c45"
@@ -1480,6 +1666,10 @@ run-async@^0.1.0:
   dependencies:
     once "^1.3.0"
 
+run-parallel@^1.1.2:
+  version "1.1.6"
+  resolved "https://registry.yarnpkg.com/run-parallel/-/run-parallel-1.1.6.tgz#29003c9a2163e01e2d2dfc90575f2c6c1d61a039"
+
 rx-lite@^3.1.2:
   version "3.1.2"
   resolved "https://registry.yarnpkg.com/rx-lite/-/rx-lite-3.1.2.tgz#19ce502ca572665f3b647b10939f97fd1615f102"
@@ -1514,6 +1704,28 @@ sprintf-js@~1.0.2:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/sprintf-js/-/sprintf-js-1.0.3.tgz#04e6926f662895354f3dd015203633b857297e2c"
 
+standard-engine@~5.4.0:
+  version "5.4.0"
+  resolved "https://registry.yarnpkg.com/standard-engine/-/standard-engine-5.4.0.tgz#e0e86959ea0786425d3383e40c1bf70d2f985579"
+  dependencies:
+    deglob "^2.1.0"
+    get-stdin "^5.0.1"
+    home-or-tmp "^2.0.0"
+    minimist "^1.1.0"
+    pkg-conf "^2.0.0"
+
+standard@^9.0.2:
+  version "9.0.2"
+  resolved "https://registry.yarnpkg.com/standard/-/standard-9.0.2.tgz#9bd3b9467492e212b1914d78553943ff9b48fd99"
+  dependencies:
+    eslint "~3.18.0"
+    eslint-config-standard "7.1.0"
+    eslint-config-standard-jsx "3.3.0"
+    eslint-plugin-promise "~3.4.0"
+    eslint-plugin-react "~6.9.0"
+    eslint-plugin-standard "~2.0.1"
+    standard-engine "~5.4.0"
+
 string-width@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/string-width/-/string-width-1.0.2.tgz#118bdf5b8cdc51a2a7e70d211e07e2b0b9b107d3"
@@ -1592,6 +1804,10 @@ typedarray@^0.0.6:
   version "0.0.6"
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
 
+uniq@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/uniq/-/uniq-1.0.1.tgz#b31c5ae8254844a3a8281541ce2b04b865a734ff"
+
 user-home@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/user-home/-/user-home-2.0.0.tgz#9c70bfd8169bc1dcbf48604e0f04b8b49cde9e9f"
@@ -1616,6 +1832,6 @@ write@^0.2.1:
   dependencies:
     mkdirp "^0.5.1"
 
-xtend@^4.0.0:
+xtend@^4.0.0, xtend@^4.0.1:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.1.tgz#a5c6d532be656e23db820efb943a1f04998d63af"