chore(package): update eslint to version 5.0.0

Author: greenkeeper[bot]

package.json

@@ -33,7 +33,7 @@
   },
   "devDependencies": {
     "ava": "^0.25.0",
-    "eslint": "^4.1.0",
+    "eslint": "^5.0.0",
     "eslint-config-gsandf": "^1.0.0"
   }
 }