Merge pull request #10 from tjmehta/greenkeeper/chai-4.0.0

Update chai to the latest version 🚀

Author: tjmehta

package.json

@@ -35,7 +35,7 @@
     "cast-array": "^1.0.1"
   },
   "devDependencies": {
-    "chai": "^3.5.0",
+    "chai": "^4.0.0",
     "graphql": "^0.9.0",
     "graphql-relay": "^0.5.0",
     "istanbul": "^0.4.5",