allow version 2.x of oauth dependency

[jrochkind]

Closes #96

Note oauth 1.x is still allowed by gemspec, just expanded to allow 2.x too. OAuth release notes expect no problems from 2.x for most uses.

You have installed oauth2 version 1.4.11, which is EOL.
No further support is anticipated for the 1.4.x series.

OAuth2 version 2 is released.
There are BREAKING changes, but most will not encounter them, and upgrading should be easy!

We have made two other major migrations:
1. master branch renamed to main
2. Github has been replaced with Gitlab

Please see:
• https://gitlab.com/oauth-xx/oauth2#what-is-new-for-v20
• https://gitlab.com/oauth-xx/oauth2/-/blob/main/CHANGELOG.md
• https://groups.google.com/g/oauth-ruby/c/QA_dtrXWXaE

Please upgrade, report issues, and support the project! Thanks, |7eter l-|. l3oling

[jrochkind]

Huh, Travis actually is running -- which really surprised me as travis had ended their support for open source.

The build seems to be failing on VCR cassette mis-matches. There are instructions for generating VCR casettes in README, but I'm not sure i have time/energy to try it. Would anyone else like to help?

I'm also not sure why the tests are passing for me locally! I did have some tries running tests where I had similar VCR cassette failures... but without changing anything but just running again, it started passing, not sure why.

[jrochkind]

Hm, I tried to regenerate vcr casettes with an dropbox oauth token, but ran into this error i'm not sure how to solve:

DropboxApi::Errors::ExpiredAccessTokenError: missing_scope/..
/Users/jrochkind/code/dropbox_api/lib/dropbox_api/endpoints/base.rb:41:in `process_response'
/Users/jrochkind/code/dropbox_api/lib/dropbox_api/endpoints/base.rb:17:in `perform_request'

[Laykou]

@Jesus Do you please know how this could be resolved?