1 git remote add origin ..../B.git
2 git remote add upstream ...../A.git
3 git fetch upstream
4 git merge upstream/master
5 git push origin master
6 pull request
1 git remote add origin ..../B.git
2 git remote add upstream ...../A.git
3 git fetch upstream
4 git merge upstream/master
5 git push origin master
6 pull request