Git - Clear Commit History

Copied shamelessly from StackOverflow

1. Checkout to an orphan branch

git checkout --orphan temp_branch

2. Add all files and commit

git add -A
git commit -am "commit message"

3. Delete the branch

git branch -D master

4. Rename current branch to master

git branch -m master

5. Force push to remote

git push -f origin master