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Changes file for prop140

Nick Mathewson 8 years ago
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+  o Major features (directory protocol):
+    - Tor relays and authorities are now able to serve clients an
+      abbreviated version of the networkstatus consensus document,
+      containing only the changes since the an older consensus document that
+      the client holds. Clients now request these documents when
+      available. When this new protocol is in use by both client and server,
+      they will use far less bandwidth (up to 94% less) to keep an up-to-date
+      consensus. Implements proposal 140; closes ticket 13339.
+