docs: update ChangeLog.

docs/changelog.rst

@@ -51,6 +51,9 @@ Core Library
   signal the connection has broken, even when one participant is not a parent
   of the other.
 
+* `16ca111e <https://github.com/dw/mitogen/commit/16ca111e>`_: handle OpenSSH
+  7.5 permission denied prompts when ``~/.ssh/config`` rewrites are present.
+
 * `9ec360c2 <https://github.com/dw/mitogen/commit/9ec360c2>`_: a new
   :meth:`mitogen.core.Broker.defer_sync` utility function is provided.