Git - Let's Fork the project

$ #Fork the "project-name" repository
$ git clone git@github.com:njoon/project-name.git
$ cd project-name/
$ git remote add upstream git@github.com:organizations/project-name.git
$ git fetch upstream

@If you want to remove the upstream
$ git remote remove upstream
----------------------------------------------------------------------------------------------

# If you want to merge from original branch(not forked master)
$ git fetch upstream

# To merge its changes into our local branch.
$ git branch -va
$ git checkout master
$ git merge upstream/master
# And you'd better use the Pull Request.


https://help.github.com/articles/syncing-a-fork