chore(package): update eslint-plugin-ava to version 4.0.1

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -67,7 +67,7 @@
     "coveralls": "^2.11.14",
     "cz-conventional-changelog": "^1.2.0",
     "eslint": "^3.7.1",
-    "eslint-plugin-ava": "^3.1.0",
+    "eslint-plugin-ava": "^4.0.1",
     "fetch-mock": "^5.5.0",
     "husky": "^0.12.0",
     "mock-webstorage": "^1.0.3",