Can we upgrade to OAuth2 please

[trsh]

No comments!

[ewencp]

@trsh I'll happily accept pull requests and review them as best I can, but it's unlikely I will personally find time to update the library to oauth2 unless it's a trivial migration. This is a small enough library that it's been feasible to maintain since I last used it 5+ years ago, but a significant upgrade like moving to oauth2 (which I, perhaps incorrectly, assume is a big update) probably isn't in the cards without external contributions.

If someone is willing to contribute code/PRs, it might help to have pointers to references (especially oauth1 -> oauth2 note), a popular service that can easily be tested against (twitter was handy for this when I first adapted the code for this library), and a larger list of services this would enable interaction with (as motivation for writing and maintaining the oauth2 support).