chore(package): update chai to version 4.1.2

Author: greenkeeper[bot]

package.json

@@ -28,7 +28,7 @@
     "z-schema": "3.18.3"
   },
   "devDependencies": {
-    "chai": "^4.1.1",
+    "chai": "^4.1.2",
     "clone-deep": "1.0.0",
     "kronos-test-interceptor": "2.1.0",
     "mocha": "^3.5.0",