apertis-pkg-merge-updates: always add the 'Sync from $UPSTREAM' message

This message is also required when a maintainer has to summarize the remaining Apertis changes. Thus, always add this message to save their time.

Edit: This change is because I'm lazy to have to manually write the same thing over and over

tools/apertis-pkg-merge-updates

@@ -153,6 +153,7 @@ def main():
     # re-summarize the remaining changes
     version = upstream_version.full_version + args.local_suffix + '1'
     msg.insert(0,'PLEASE SUMMARIZE remaining Apertis changes')
+    msg.append("Remaining Apertis specific changes:")
     bump_version(
         version,
         args.osname,