note issue #

git-svn-id: https://protobuf-c.googlecode.com/svn/trunk@161 00440858-1255-0410-a3e6-75ea37f81c3a

ChangeLog

@@ -26,4 +26,5 @@
       - Destroy function typedef for Services was omitting a "*"
       - service_machgen_invoke was broken. (issue 12)
       - add RPC system (BETA)
-      - don't segfault when packing NULL strings and messages.
+      - don't segfault when packing NULL strings and messages. (issue 13)
+