chore(deps): update dependency js-yaml to v4 [security]

Author: renovate[bot]

package.json

@@ -74,7 +74,7 @@
     "chai-spies": "0.7.1",
     "cross-env": "6.0.3",
     "husky": "3.0.9",
-    "js-yaml": "3.13.1",
+    "js-yaml": "4.1.1",
     "json-stringify-pretty-compact": "2.0.0",
     "lint-staged": "9.4.2",
     "mocha": "6.2.1",