chore(package): update chai to version 3.5.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -29,7 +29,7 @@
     "imgflo-url": "^1.2.0"
   },
   "devDependencies": {
-    "chai": "^3.3.0",
+    "chai": "^3.5.0",
     "coffee-script": "^1.10.0",
     "mocha": "^3.1.2"
   },