Merge pull request #24 from iansinnott/greenkeeper/ava-0.22.0

Update ava to the latest version 🚀

Author: iansinnott

package.json

@@ -34,7 +34,7 @@
     "lodash": "^4.17.4"
   },
   "devDependencies": {
-    "ava": "^0.20.0",
+    "ava": "^0.22.0",
     "babel-eslint": "^7.1.1",
     "eslint": "^3.10.2",
     "eslint-config-iansinnott": "^1.0.1",