Update dependency eslint to v5.15.1

Author: renovate-bot

Diff for: package.json

@@ -13,7 +13,7 @@
   },
   "dependencies": {
     "babel-eslint": "10.0.1",
-    "eslint": "5.13.0",
+    "eslint": "5.15.1",
     "eslint-plugin-prettier": "3.0.1",
     "prettier": "1.16.3"
   }