Update README.md

Author: belforte

README.md

@@ -5,7 +5,7 @@ Command Line client for the CRABServer REST interface.
 BRANCHES as of August 30 2021
 * master
   * for porting to python3, no WMCore etc.
-* v3.210607patch
+* v3.210607patch (now deprecated)
   * forked from tag v3.210607 which is now in production
   * to push important, needed patched to production but aim is to keep stable while working on py3
 * py2only