CONTRIBUTING.md in estella-5.0.1 vs CONTRIBUTING.md in estella-6.0.0

@@ -30,12 +30,12 @@
 ### Create a Topic Branch
 
 Make sure your fork is up-to-date and create a topic branch for your feature or bug fix.
 
 ```
-git checkout master
-git pull upstream master
+git checkout main
+git pull upstream main
 git checkout -b my-feature-branch
 ```
 
 ### Write Tests
 
@@ -102,14 +102,14 @@
 git push origin my-feature-branch -f
 ```
 
 ### Rebase
 
-If you've been working on a change for a while, rebase with upstream/master.
+If you've been working on a change for a while, rebase with upstream/main.
 
 ```
 git fetch upstream
-git rebase upstream/master
+git rebase upstream/main
 git push origin my-feature-branch -f
 ```
 
 ### Check on Your Pull Request