chore(package): update eslint-plugin-ava to version 4.0.0

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -63,7 +63,7 @@
     "coveralls": "^2.11.14",
     "cz-conventional-changelog": "^1.2.0",
     "eslint": "^3.7.1",
-    "eslint-plugin-ava": "^3.1.0",
+    "eslint-plugin-ava": "^4.0.0",
     "husky": "^0.11.9",
     "nyc": "^8.4.0",
     "rimraf": "^2.5.4",