Merge pull request #6 from onbjerg/greenkeeper/ava-0.21.0

Update ava to the latest version 🚀

Author: onbjerg

package.json

@@ -7,7 +7,7 @@
   "author": "Oliver Nordbjerg <[email protected]>",
   "license": "MIT",
   "devDependencies": {
-    "ava": "^0.20.0",
+    "ava": "^0.21.0",
     "babel-cli": "^6.23.0",
     "babel-preset-es2015": "^6.22.0",
     "babel-preset-react": "^6.23.0",