chore(deps): update dev dependency eslint to v5 (#13)

Author: renovate[bot]

package.json

@@ -60,7 +60,7 @@
     "chalk": "^2.4.1",
     "codecov": "^3.1.0",
     "cross-spawn": "^6.0.5",
-    "eslint": "^4.19.1",
+    "eslint": "^5.9.0",
     "eslint-config-standard": "^11.0.0",
     "eslint-friendly-formatter": "^4.0.1",
     "eslint-loader": "^2.1.1",