omnipay-square v3

[Alofoxx]

Hi @mnwalker do you still want to actively maintain this repository?

I have been working on v3 of this client with contributions from the other forks and am planning on doing a PR back here if so.
Please let me know. I have some organizations I work with that depend on this client so I have been maintaining it for that and am happy to build on it for the community if you need someone to help maintain this activity going forward and review community PRs

I am working on getting the documentation and testing updated for v3 here: https://github.com/Alofoxx/omnipay-square