Create and merge a local git branch.

$ git status
On branch master
Your branch is up to date with 'origin/master'.

$ git checkout -b pyside
Switched to a new branch 'pyside'

$ git status
On branch pyside
Changes not staged for commit:
(use "git add <file>..." to update what will be committed)
(use "git restore <file>..." to discard changes in working directory)
modified:   requirements.txt

no changes added to commit (use "git add" and/or "git commit -a")

$ git add -A
$ git commit -m "pyside added to requirements"
[pyside a069fc42] pyside added to requirements
1 file changed, 2 insertions(+)

$ git checkout master
Switched to branch 'master'
Your branch is up to date with 'origin/master'.

$ git merge pyside
Updating 33654d11..a069fc42
Fast-forward
python/requirements.txt | 2 ++
1 file changed, 2 insertions(+)

$ git status
On branch master
Your branch is ahead of 'origin/master' by 1 commit.
(use "git push" to publish your local commits)

nothing to commit, working tree clean