Mention that John and I maintain Dulwich these days.

README

@@ -30,4 +30,5 @@ you are trying an unsupported operation.
 
 The project is named after the part of London that Mr. and Mrs. Git live in 
 in the particular Monty Python sketch. It is based on the Python-Git module 
-that James Westby <jw+debian@jameswestby.net> released in 2007.
+that James Westby <jw+debian@jameswestby.net> released in 2007 and now 
+maintained by Jelmer Vernooij and John Carr.