Bump js-yaml from 3.13.1 to 3.15.2

Bumps [js-yaml](https://github.com/nodeca/js-yaml) from 3.13.1 to 3.15.2.
- [Changelog](https://github.com/nodeca/js-yaml/blob/3.15.2/CHANGELOG.md)
- [Commits](https://github.com/nodeca/js-yaml/compare/3.13.1...3.15.2)

---
updated-dependencies:
- dependency-name: js-yaml
  dependency-version: 3.15.2
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -42,7 +42,7 @@
     "eslint-plugin-jest": "^22.21.0",
     "jest": "^24.9.0",
     "jest-circus": "^24.9.0",
-    "js-yaml": "^3.13.1",
+    "js-yaml": "^3.15.2",
     "prettier": "^1.19.1",
     "ts-jest": "^24.2.0",
     "typescript": "^3.6.4"