chore(package): update chai to version 4.1.1

Closes #14

Author: greenkeeper[bot]

package.json

@@ -40,7 +40,7 @@
   },
   "devDependencies": {
     "@bubltechnology/customizable-commit-analyzer": "1.0.2-0",
-    "chai": "3.5.0",
+    "chai": "4.1.1",
     "compression": "1.6.2",
     "condition-circle": "1.5.0",
     "cors": "2.8.3",