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

Closes #19

Author: greenkeeper[bot]

package.json

@@ -30,7 +30,7 @@
   "devDependencies": {
     "del-cli": "^1.1.0",
     "eslint": "^4.1.1",
-    "eslint-plugin-ava": "^4.2.1",
+    "eslint-plugin-ava": "^5.1.1",
     "eslint-plugin-import": "^2.6.0",
     "eslint-plugin-itgalaxy": "^60.0.0",
     "eslint-plugin-jest": "^21.1.0",