Changes file.

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+  o Major features (Circuit padding):
+    - Onion service clients will now add padding cells to the initial portions
+      of their INTRODUCE and RENDEZVOUS circuits, to make those circuits'
+      traffic patterns look more like general purpose Exit traffic. The
+      overhead for this is 2 extra cells in each direction for RENDEZVOUS
+      circuits, and 1 extra upstream cell and 10 downstream cells for INTRODUCE
+      circuits. This will only be enabled if the circuit's middle node supports
+      this feature, too. (Clients may specify fixed middle nodes with the MiddleNodes
+      torrc directive, and may force-disable this feature with the CircuitPadding
+      torrc directive). Closes ticket 28634.