chore(deps-dev): 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>

package.json

@@ -34,7 +34,7 @@
     "babel-register": "^6.6.5",
     "chokidar-cli": "^1.2.0",
     "coveralls": "^2.13.1",
-    "eslint": "^3.0.1",
+    "eslint": "^4.18.2",
     "eslint-config-xo": "^0.18.2",
     "eslint-plugin-babel": "^4.1.1",
     "eslint-plugin-require-path-exists": "^1.1.7",