Provide commit sha to start with

[masim05]

Thanks for such a useful tool.

Current high level logic of gren.js release --data-source=commits is:

• determine a date range
• pick commits in master branch within this range
• create release notes using the commits

As a result, the following workflow is problematic (release notes are empty):

• create a new release branch from master
• merge to the release branch new changes
• tag the release branch
• generate release notes from the tag
• merge release to master

One option to fix it is to provide sha to start history with. Currently it is not provided so default master is used.

I will create a PR doing that. Also any workaround is appreciated.

The issue may be related to https://github.com/github-tools/github-release-notes/issues/195 and https://github.com/github-tools/github-release-notes/issues/116 .