Update release process to use 'Merge commit' (#1530)

Co-authored-by: Bill Bejeck <bbejeck@gmail.com>

Author: davetroiano

README.md

@@ -596,7 +596,7 @@ plus many other small fixes
 
 3. Look at the staging site from different browsers. Ensure that you get approval from required reviewers. Submit PRs with fixes, if needed.
 
-4. Once the PR is approved, merge the PR via `Squash and Merge`.
+4. Once the PR is approved, merge the PR via `Merge commit`.
 
 ### Deploy to live site