Bump mustache from 0.7.3 to 3.1.0
Bump mustache from 0.7.3 to 3.1.0

Bumps [mustache](https://github.com/janl/mustache.js) from 0.7.3 to 3.1.0.
- [Release notes](https://github.com/janl/mustache.js/releases)
- [Changelog](https://github.com/janl/mustache.js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/janl/mustache.js/compare/0.7.3...v3.1.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
omiend/reveal,omiend/reveal