Changelog entry for implementation of proposal 121.

svn:r16706

ChangeLog

 Changes in version 0.2.1.5-alpha - 2008-08-31
-  o Major features [IPv6 support]:
+  o Major features:
     - Convert many internal address representations to optionally hold
       IPv6 addresses.
     - Generate and accept IPv6 addresses in many protocol elements.
     - Make resolver code handle nameservers located at ipv6 addresses.
     - Begin implementation of proposal 121 (Client authorization for
-      hidden services): associate keys, client lists, and authorization
-      types with hidden services.
+      hidden services): configure hidden services with client
+      authorization, publish descriptors for them, and configure
+      authorization data for hidden services at clients. (The only missing
+      piece is to actually access hidden services that perform client
+      authorization.)
     - Network status consensus documents and votes now contain for each
       router bandwidth information and a summary of that router's exit
       policy.  This will in the future be used by clients so that they