Allow .github directory to contain contribution guidelines

[kdeldycke]

Like code-of-conduct.md file, contribution.md is allowed to be placed in the .github subfolder of a repository.

To help your project contributors do good work, you can add a file with contribution guidelines to your project repository's root, docs, or .github folder.

Source: https://help.github.com/en/github/building-a-strong-community/setting-guidelines-for-repository-contributors

[sindresorhus]

Tests are failing.

[kdeldycke]

I'm going to fix them. The thing is, I'm no JS dev so I'm fighting the ecosystem on my local machine. 😅 Don't worry, I'll eventually figure things out and propose a clean PR. I just need more time than usual. 🙂

[kdeldycke]

Tests have been fixed and are now passing. This PR is ready to be merged.

[kdeldycke]

Thanks @sindresorhus for the quick merge! 😃