[Xotcl] Git repository: Branch "master" was renamed to "main"

[Stefan Sobernig]

Hi everyone!

If you happen to maintain a local clone of the NSF/XOTcl repository, 
please mind the renaming. Rather than re-cloning, run the following:

$ git checkout master
$ git branch -m master main
$ git fetch
$ git branch --unset-upstream
$ git branch -u origin/main
$ git symbolic-ref refs/remotes/origin/HEAD refs/remotes/origin/main

Thank you!
    Stefan