chore(deps): update dependency chai to v4.3.6

Author: renovate-bot

package-lock.json

@@ -66,7 +66,7 @@
     "@commitlint/config-conventional": "8.3.4",
     "@commitlint/travis-cli": "8.3.4",
     "@lykmapipo/mongoose-test-helpers": "0.7.24",
-    "chai": "4.2.0",
+    "chai": "4.3.6",
     "commitizen": "4.0.3",
     "coveralls": "3.0.9",
     "cz-conventional-changelog": "3.0.2",