Merge pull request #16 from IndigoUnited/greenkeeper-chai-4.0.1

Update chai to version 4.0.1 🚀

Author: satazor

package.json

@@ -28,7 +28,7 @@
   "devDependencies": {
     "@satazor/eslint-config": "^3.0.0",
     "browserify": "^14.3.0",
-    "chai": "^3.5.0",
+    "chai": "^4.0.1",
     "coveralls": "^2.11.9",
     "eslint": "^3.0.0",
     "istanbul": "^0.4.3",