build: Update mocha requirement to ^5.0.0 (#12)
build: Update mocha requirement to ^5.0.0 (#12)

Updates the requirements on [mocha](https://github.com/mochajs/mocha) to permit the latest version.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mochajs/mocha/commits/v5.0.0)
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