Bump mustache from 1.1.0 to 2.2.1

Bumps [mustache](https://github.com/janl/mustache.js) from 1.1.0 to 2.2.1.
- [Release notes](https://github.com/janl/mustache.js/releases)
- [Changelog](https://github.com/janl/mustache.js/blob/master/CHANGELOG.md)
- [Commits](janl/mustache.js@v1.1.0...v2.2.1)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]