chore: Update docs to reflect the new default branch (#524)

Contributing.md

@@ -7,7 +7,7 @@
 Please review the [Code of Conduct](./CODE_OF_CONDUCT.md) for this project.
 
 ### Contribution model 
-All contributions to this project should be through pull requests (PR) against the `master` branch.
+All contributions to this project should be through pull requests (PR) against the `main` branch.
 
 Before you start, make sure you have read the [Git branch setup instructions](./docs/GitBranchSetup.md).
 

docs/GitBranchSetup.md

@@ -55,27 +55,32 @@ upstream        https://github.com/Microsoft/axe-windows (push)
 
 -   At this point you are ready to start branching and contributing back changes.
 
+## Default branch
+
+As of February 2021, the default branch is the `main` branch
+
 ## Making code changes and creating a pull request
 
-Create a branch from your fork and start making the code changes. Once you are happy with the changes, and want to merge them to the main **axe-windows** project, create a pull request from your branch directly to "Microsoft/axe-windows master".
+Create a branch from your fork and start making the code changes. Once you are happy with the changes, and want to merge them to the main **axe-windows** project, create a pull request from your branch directly to "Microsoft/axe-windows main".
 
-## Merging upstream master into your fork master
+## Merging upstream main into your fork main
 
-From time to time, your fork will get out of sync with the upstream remote. Use the following commands to get the master branch of your fork up to date.
+From time to time, your fork will get out of sync with the upstream remote. Use the following commands to get the main branch of your fork up to date.
 
 ```bash
 git fetch upstream
-git checkout master
-git pull upstream master
+git checkout main
+git pull upstream main
 git push
 ```
 
-## Merging upstream master into your current branch
+## Merging upstream main into your current branch
 
 Use these commands instead if you would like to update your current branch in your fork from the upstream remote.
 
 ```bash
 git fetch upstream
-git pull upstream master
+git pull upstream main
 git push
 ```
+