change the branch to master code example

Example: git change master branch

## 1) Rename master branch to oldmaster.
git branch -m master oldmaster
#Now there is no master branch on my local machine.

## 2) Rename my masterTemp branch to master
git branch -m masterTemp master
#The branch which was named masterTemp on my local machine is now master

## 3) Delete the branch from remote
git branch -rD master

## 4) Push the new master branch to remote
git push --force origin master