chore(package): update eslint-plugin-ava to version 5.1.1

Closes #40

Author: greenkeeper[bot]

package.json

@@ -42,7 +42,7 @@
     "browser-sync": "^2.18.8",
     "babel-eslint": "^8.2.2",
     "eslint": "^4.1.1",
-    "eslint-plugin-ava": "^4.2.1",
+    "eslint-plugin-ava": "^5.1.1",
     "eslint-plugin-import": "^2.6.1",
     "eslint-plugin-itgalaxy": "^66.0.0",
     "eslint-plugin-jest": "^21.15.0",