Bump eslint from 3.8.1 to 4.18.2

Bumps [eslint](https://github.com/eslint/eslint) from 3.8.1 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@v3.8.1...v4.18.2)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package.json

@@ -36,7 +36,7 @@
     "css-loader": "0.26.0",
     "detect-port": "1.0.1",
     "dotenv": "2.0.0",
-    "eslint": "3.8.1",
+    "eslint": "4.18.2",
     "eslint-config-react-app": "^0.5.0",
     "eslint-loader": "1.6.0",
     "eslint-plugin-flowtype": "2.21.0",