Switch master to main (#59)

Author: hugovk

README.md

@@ -122,7 +122,7 @@ To set up the action for local development and testing:
 
 1. Create a fork of the github-project-automation-plus
 2. Create a new repository with a project
-3. Add a workflow file that changes the `uses` to your forked repository: `uses: my-fork/github-project-automation-plus@master`
+3. Add a workflow file that changes the `uses` to your forked repository: `uses: my-fork/github-project-automation-plus@main`
 3. Make changes to your action and deploy them to GitHub