build(deps): bump js-yaml from 3.12.1 to 3.13.1 (#20)

Bumps [js-yaml](https://github.com/nodeca/js-yaml) from 3.12.1 to 3.13.1.
- [Release notes](https://github.com/nodeca/js-yaml/releases)
- [Changelog](https://github.com/nodeca/js-yaml/blob/master/CHANGELOG.md)
- [Commits](nodeca/js-yaml@3.12.1...3.13.1)

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