Bump eslint from 3.19.0 to 4.18.2

Bumps [eslint](https://github.com/eslint/eslint) from 3.19.0 to 4.18.2.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v3.19.0...v4.18.2)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -43,7 +43,7 @@
     "copy-webpack-plugin": "^4.0.1",
     "css-loader": "^0.28.0",
     "cssnano": "^3.10.0",
-    "eslint": "^3.19.0",
+    "eslint": "^4.18.2",
     "eslint-config-airbnb-base": "^11.1.3",
     "eslint-friendly-formatter": "^3.0.0",
     "eslint-import-resolver-webpack": "^0.8.1",