Add changes file for channels (ticket 6465)

diff --git a/changes/bug6465 b/changes/bug6465
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+  o Infrastructure features:
+    - Introduce new channel_t abstraction between circuits and or_connection_t
+      to allow for implementing alternate OR-to-OR transports.  A channel_t is
+      an abstract object which can either be a cell-bearing channel, which is
+      responsible for authenticating and handshaking with the remote OR and
+      transmitting cells to and from it, or a listening channel, which spawns
+      new cell-bearing channels at the request of remote ORs.
+
+    - Also new is the channel_tls_t subclass of channel_t, adapting it to the
+      existing or_connection_t code.  The V2/V3 protocol handshaking code
+      which formerly resided in command.c has been moved below the channel_t
+      abstraction layer and may be found in channeltls.c now.