Chore(deps-dev): Bump eslint from 3.19.0 to 4.18.2 (#41)

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] <[email protected]>

Author: dependabot[bot]

package.json

@@ -40,7 +40,7 @@
   },
   "devDependencies": {
     "del": "^3.0.0",
-    "eslint": "^3.19.0",
+    "eslint": "^4.18.2",
     "eslint-config-airbnb-base": "^11.2.0",
     "eslint-plugin-import": "^2.7.0",
     "execa": "^0.7.0",