Add support for pre-commit package manager

[paulhfischer]

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Resolves the request for pre-commit support in issue pre-commit/pre-commit.com/345. Some additional notes:

• There's an open pull request in librariesio/bibliothecary, which adds the bibliothecary support.
• Versioning is done by git tags, thus i did not implement a method for this

Let me know if you have questions or if there's anything to add/change.

[paulhfischer]

@katzj could you have a look at the PR if you have time and tell me if the PR is okay or if there is a problem with the added library?