Update default branch of repo

[frob]

Describe the feature or problem you'd like to solve
There is currently not update anything about a gitlab project/repo. I would like to update the default branch of a repo. It might also be nice to update other settings for the a repo.

Propose a Solution
Add a glab repo update command and allow for editing some of the settings of the repo. Specifically I would like to be able to update the default branch of a project.

[frob]

Looks like https://github.com/profclems/glab/blob/trunk/api/project.go will need to be edited to implement EditProject from https://github.com/xanzy/go-gitlab/blob/master/projects.go#L880

Once that has been done we would need to update https://github.com/profclems/glab/tree/trunk/commands/project to include the new functionality.

Of course, all appropriate tests will also be needed.

[clemsbot]

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