Master branch has been renamed to main

[Ligia Bernardet - NOAA Federal]

Hello CCPPers,

The master branches of the following repositories have been renamed to main to be sensitive to anti-racism practices.

https://github.com/NCAR/ccpp-scm

https://github.com/NCAR/ccpp-physics

https://github.com/NCAR/ccpp-framework

https://github.com/NCAR/ccpp-doc

Please refer to the GitHub instructions at https://docs.github.com/en/github/administering-a-repository/renaming-a-branch for how to update a local clone after a branch name changes.

If questions arise, please enter them in the GitHub discussions of the repositories.

Best,

Ligia