Remove trailing newline characters from git branch

[robin-moser]

On MacOS, the parsing of the git branch results in an added newline character:

 - 2025-07-25 12:50:36 (0:00:02) {'branch': 'main\n', 'file': 'README.md', 'language': 'markdown', 'project': 'nvim'}

This PR removes these characters, if they are present. I don't know if this is a MacOS specific bug, or even only local to my machine, but i think it wouldn't hurt to add this check to all systems. What dou you think?

EDIT:
Also, if I'm not in a git repository, the git error gets written in the branch field:

- 2025-07-25 13:12:40 (0:00:12) {'branch': 'fatal: not a git repository (or any of the parent directories): .git', 'file': 'test.sh', 'language': 'sh', 'project': 'test'}

I added a commit to supress stderr.

Thanks for the plugin!

[lowitea]

Hi, thanks for the pr.
Yes, it looks more robust.