Fix link for subscribing to the caml-list

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@16448 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02

Author: jeremiedimino

README

@@ -110,7 +110,7 @@ Messages to the list should be sent to:
 
 You can subscribe to this list via the Web interface at
 
-        https://sympa-roc.inria.fr/wws/info/caml-list
+        https://sympa.inria.fr/sympa/subscribe/caml-list
 
 Archives of the list are available on the Web site above.