lmplements the inter-process readers writer lock

[psarka]

This PR implements an inter-process readers writer lock, as suggested in https://github.com/harlowja/fasteners/issues/42.

I tried to stay very close to the existing code, in particular the structure, naming conventions, supported versions and the API. I took a bit more liberties with refreshing the documentation and README file, as well as fixed travis and added a gitignore.

I'm a bit unhappy that the intersection of windows and unix lock features is very small, but I don't know what to do about that apart from trying to build a readers writer locks myself, from lower level primitives. I'm not sure it is easy to do that.

Let me know what you think!

[psarka]

@harlowja I'm waiting for this PR for my personal project, so I thought, maybe you need a hand with maintaining fasteners in general? I see many issues and PRs waiting, I could help out. Feel free to drop me an email at paulius.sarka@gmail.com.

[harlowja]

Ya, ownership is more than welcome :)

[psarka]

Cool! How can I get started?

[harlowja]

Hmmm, guess we need some kind of CODEOWNERS file with u in it?

[psarka]

As I understand from the docs, CODEOWNERS is optional. I think inviting me as a collaborator shoud be enough: https://docs.github.com/en/free-pro-team@latest/github/setting-up-and-managing-your-github-user-account/inviting-collaborators-to-a-personal-repository

[harlowja]

Ah, ok, that works to.

[harlowja]

U've been invited.

[harlowja]

Resolve conflicts?

[psarka]

Done :+1:

[harlowja]

Nice, I'm not sure if its possible to have travis update pypi, might be nice to do that; because it was just done by me before, lol