[_fixed] git merge to be --ff-only

Author: appsforartists

RELEASING.md

@@ -27,6 +27,6 @@ To push a new build to NPM, follow these steps.  If the process changes, please
 12. Update the `stable` branch:
     ```
     git checkout stable
-    git merge develop --ff
+    git merge develop --ff-only
     git push origin stable
     ```