Bump knplabs/github-api from 3.0.0 to 3.1.0 (#444)

Bumps [knplabs/github-api](https://github.com/KnpLabs/php-github-api) from 3.0.0 to 3.1.0.
- [Release notes](https://github.com/KnpLabs/php-github-api/releases)
- [Changelog](https://github.com/KnpLabs/php-github-api/blob/master/CHANGELOG-3.X.md)
- [Commits](KnpLabs/php-github-api@v3.0.0...v3.1.0)

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