chore(package): update eslint to version 5.12.1

Closes #18

Author: greenkeeper[bot]

package.json

@@ -29,7 +29,7 @@
   },
   "devDependencies": {
     "del-cli": "^1.1.0",
-    "eslint": "^4.1.1",
+    "eslint": "^5.12.1",
     "eslint-plugin-ava": "^4.2.1",
     "eslint-plugin-import": "^2.6.0",
     "eslint-plugin-itgalaxy": "^60.0.0",