chore(package): update eslint to version 5.15.1

Closes #272

Author: greenkeeper[bot]

package.json

@@ -80,7 +80,7 @@
     "babel-types": "^6.26.0",
     "babylon": "^6.18.0",
     "codeclimate-test-reporter": "^0.5.0",
-    "eslint": "^4.12.1",
+    "eslint": "^5.15.1",
     "husky": "^0.14.3",
     "inotifywait": "^1.8.3",
     "jest": "^21.2.1",