Merge pull request #2 from aureooms/greenkeeper/ava-0.18.1

Update ava to the latest version 🚀

Author: Aurélien Ooms

package.json

@@ -27,7 +27,7 @@
   },
   "devDependencies": {
     "aureooms-js-itertools": "^3.1.0",
-    "ava": "^0.17.0",
+    "ava": "^0.18.1",
     "babel-cli": "^6.18.0",
     "babel-polyfill": "^6.16.0",
     "babel-preset-latest": "^6.16.0",