Add option to only consider commits introduced by a given branch

[tupini07]

It would be very nice if we could generate a report considering only commits which were introduced in a given branch.

We would probably need to compare the current branch (or a given branch) against another to know which commits we have that the other branch doesn't (eg, HEAD vs. master).

The functionality I'm thinking of is like the following but with git-journal output:

git log master..develop --oneline --no-merges

This would be a very useful feature when making a commit report for a pull requests.

[issue-label-bot]

Issue-Label Bot is automatically applying the label feature_request to this issue, with a confidence of 0.98. Please mark this comment with 👍 or 👎 to give our bot feedback!

Links: app homepage, dashboard and code for this bot.

[saschagrunert]

Hey @tupini07, thank you for the feature request. :) This sounds like a valuable addition to me, do you mind opening a PR to contribute it?