Bump eslint from 2.10.2 to 4.18.2 (#331)

Bumps [eslint](https://github.com/eslint/eslint) from 2.10.2 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@v2.10.2...v4.18.2)

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

Author: dependabot[bot]

package.json

@@ -56,7 +56,7 @@
     "babel-eslint": "^8.0.2",
     "babel-jest": "^21.2.0",
     "babel-preset-env": "^1.6.1",
-    "eslint": "2.10.2",
+    "eslint": "4.18.2",
     "eslint-config-formidable": "^3.0.0",
     "eslint-config-prettier": "^2.9.0",
     "eslint-plugin-filenames": "^1.2.0",