Bump minimist, http-server and mocha

Bumps [minimist](https://github.com/substack/minimist), [http-server](https://github.com/http-party/http-server) and [mocha](https://github.com/mochajs/mocha). These dependencies needed to be updated together.

Updates `minimist` from 0.0.8 to 1.2.6
- [Release notes](https://github.com/substack/minimist/releases)
- [Commits](https://github.com/substack/minimist/compare/0.0.8...1.2.6)

Updates `http-server` from 0.11.1 to 14.1.1
- [Release notes](https://github.com/http-party/http-server/releases)
- [Commits](http-party/http-server@0.11.1...v14.1.1)

Updates `mocha` from 6.2.0 to 6.2.3
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](mochajs/mocha@v6.2.0...v6.2.3)

---
updated-dependencies:
- dependency-name: minimist
  dependency-type: indirect
- dependency-name: http-server
  dependency-type: direct:development
- dependency-name: mocha
  dependency-type: direct:development
...

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

Author: dependabot[bot]