chore(deps): update chai to 4.3.7 🌟

Author: renovate[bot]

package-lock.json

@@ -33,7 +33,7 @@
   },
   "devDependencies": {
     "bluebird": "3.5.1",
-    "chai": "4.1.2",
+    "chai": "4.3.7",
     "eslint": "4.19.1",
     "eslint-plugin-cypress-dev": "1.1.2",
     "eslint-plugin-mocha": "4.12.1",