Merge pull request #723 from tigarcia/change_master_to_main

Branch name change from master to main

.github/contributing.md

@@ -52,7 +52,7 @@ If the contribution doesn't meet the above criteria, you may fail our automated
 3.  :herb: Create a new branch and check it out.
 4.  :crystal_ball: Make your changes and commit them locally. Magic happens here!
 5.  :arrow_heading_up: Push your new branch to your fork. (e.g. `git push username fix-issue-16`).
-6.  :inbox_tray: Open a Pull Request on github.com from your new branch on your fork to `master` in this
+6.  :inbox_tray: Open a Pull Request on github.com from your new branch on your fork to `main` in this
     repository.
 
 ## Maintainers