Move to main instead of master branch

[allenh1]

In the spirit of the discussion here, I'd like to go ahead and apply that to this repo.

I also plan to make changes here:

superflore/superflore/repo_instance.py

Line 37 in 40248f0

self.from_branch = from_branch or 'master'

and here:

superflore/superflore/repo_instance.py

Line 95 in 40248f0

def pull_request(self, message, title, branch='master', remote='origin'):

@herb-kuta-lge will this change disrupt you in your efforts? Don't want to break anything for Open Embedded.

[herb-kuta-lge]

@herb-kuta-lge will this change disrupt you in your efforts? Don't want to break anything for Open Embedded.

No. We only create branches.

Is it worth trying to handle the case where the repo has yet to rename its master?