Bump js-yaml from 3.5.5 to 3.14.0 (#551)

Bumps [js-yaml](https://github.com/nodeca/js-yaml) from 3.5.5 to 3.14.0.
- [Release notes](https://github.com/nodeca/js-yaml/releases)
- [Changelog](https://github.com/nodeca/js-yaml/blob/master/CHANGELOG.md)
- [Commits](nodeca/js-yaml@3.5.5...3.14.0)

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