git fork then follow the source repositories update

git_fork_update.sh

# add remote upstream source
git remote add upstream https://github.com/encode/requests-async.git

# check the remote status
git remote -v

# fetch the upstream lastest update
git fetch upstream

# change current branch to master
git checkout master

# user merge or rebase to combine code
# merge will keep your own merge log.
# rebase only let code to upstream newest commit
# if you want keep log clean, need use rebase
git rebase/merge upstream/master

# check the commit 
git log

# push current master to origin
git push origin master