Update dependency eslint to v4.18.2

Author: renovate-bot

package.json

@@ -34,7 +34,7 @@
     "ava": "0.18.2",
     "common-tags": "1.4.0",
     "coveralls": "2.12.0",
-    "eslint": "3.18.0",
+    "eslint": "4.18.2",
     "eslint-plugin-ava": "4.2.0",
     "fs-extra": "2.1.2",
     "nyc": "10.2.0",