update release flow (#181)

Author: jennijuju

README.md

@@ -105,12 +105,14 @@ You can also _set_ a specific version with the `set-version` target.
 make set-version VERSION=7.1.1
 ```
 
-Finally, commit the version changes:
+Commit the version changes:
 
 ```bash
 git commit -a -m "Release $(make --quiet version)"
 ```
 
+Finally, create a PR to commit your changes, make sure your PR is approved and merged before move to the next step!
+
 ### 3: Publish Crates
 
 **NOTE:** If you're a not a member of the core FVM team, you'll need help with this step. Please