chore: bump version to 2.0.0-rc.1

[VincentRPS]

Summary

Bumps version from alpha to a release candidate as bob wanted.
not to be merged until 1/19/22 the "feature freeze"

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• If type: ignore comments were used, a comment is also left explaining why
• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, typehinting, examples, ...)

[BobDotCom]

I planned on using release candidates after the feature freeze, since the releases in that time may not be the same as the final release, if there are bugs and such.