chore(package): update chai to version 3.5.0 (#2317)

https://greenkeeper.io/ [skip ci]

Author: greenkeeperio-bot

Diff for: package.json

@@ -60,7 +60,7 @@
   "devDependencies": {
     "babel-plugin-transform-class-properties": "^6.18.0",
     "babel-preset-es2015": "^6.18.0",
-    "chai": "^3.2.0",
+    "chai": "^3.5.0",
     "del": "^2.2.0",
     "grunt": "^1.0.1",
     "grunt-build-control": "^0.7.0",