Merge pull request #44 from graphcool/greenkeeper/ava-0.24.0

Update ava to the latest version 🚀

Author: schickling

package.json

@@ -50,7 +50,7 @@
     "@types/graphql": "^0.11.6",
     "@types/node": "^8.0.53",
     "@types/node-fetch": "1.6.7",
-    "ava": "^0.23.0",
+    "ava": "^0.24.0",
     "babel-polyfill": "^6.26.0",
     "babel-preset-es2015": "^6.16.0",
     "babel-preset-stage-0": "^6.16.0",