Bump mocha from 8.1.2 to 8.1.3 (#96)

Bumps [mocha](https://github.com/mochajs/mocha) from 8.1.2 to 8.1.3.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](mochajs/mocha@v8.1.2...v8.1.3)

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Author: dependabot[bot]