Add your github fork replicas as remote to the clone of your own repo:
git remote add other-guys-repo <url to other guys repo>
Get your changes:
git fetch other-guys-repo
Reserve the branch you want to merge into:
git checkout my_new_branch
Combine their changes (provided that they have done their work on the main branch):
git merge other-guys-repo/master
To resolve conflicts, make decisions and voila.
Ilkka Apr 09 2018-11-11T00: 00Z
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