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

@@ -17,7 +17,7 @@
   "devDependencies": {
     "coveralls": "^2.11.12",
     "csslint-stylish": "0.0.4",
-    "eslint": "^3.2.2",
+    "eslint": "^4.18.2",
     "eslint-config-semistandard": "^7.0.0-beta.0",
     "eslint-config-standard": "^6.0.0-beta.2",
     "eslint-plugin-promise": "^2.0.1",