My development team and I are new to OpenMRS and have just started our first contributions. We have claimed a JIRA ticket, and have come to a point where we feel we are ready to submit a pull request. I have successfully mashed all of our commits into one, as https://github.com/openmrs/openmrs-core/blob/master/CONTRIBUTING.md suggests I should, but when I attempt to create the pull request, I can’t seem to find how to set the commit range to only include this single commit.