Bump handlebars from 4.0.6 to 4.7.6
Bump handlebars from 4.0.6 to 4.7.6

Bumps [handlebars](https://github.com/wycats/handlebars.js) from 4.0.6 to 4.7.6.
- [Release notes](https://github.com/wycats/handlebars.js/releases)
- [Changelog](https://github.com/handlebars-lang/handlebars.js/blob/master/release-notes.md)
- [Commits](https://github.com/wycats/handlebars.js/compare/v4.0.6...v4.7.6)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
awayken/2016-Christmas-Card,awayken/2016-Christmas-Card