chore(package): update eslint to version 4.12.0

Closes #40

Author: greenkeeper[bot]

package.json

@@ -27,7 +27,7 @@
     "@commitlint/config-angular": "^4.2.1",
     "chai": "^4.0.0",
     "conventional-github-releaser": "^1.1.3",
-    "eslint": "^3.2.2",
+    "eslint": "^4.12.0",
     "eslint-config-gemini-testing": "^2.2.0",
     "gemini": "^4.4.4",
     "husky": "^0.13.2",