Update next-release notes.

docs/releases/next.rst

@@ -14,3 +14,20 @@ In Progress
   while idle.
 * `.FacebookGraphMixin` has been updated to use the current Facebook login
   URL, which saves a redirect.
+* `.IOStream` now recognizes ``ECONNABORTED`` error codes in more places
+  (which was mainly an issue on Windows).
+* `.IOStream` now frees memory earlier if a connection is closed while
+  there is data in the write buffer.
+* `.StaticFileHandler` no longer fails if the client requests a ``Range`` that
+  is larger than the entire file (Facebook has a crawler that does this).
+* `.PipeIOStream` now handles ``EAGAIN`` error codes correctly.
+* `.SSLIOStream` now initiates the SSL handshake automatically without
+  waiting for the application to try and read or write to the connection.
+* `.IOLoop` now uses `~.IOLoop.handle_callback_exception` consistently for
+  error logging.
+* `.RequestHandler.on_connection_close` now works correctly on subsequent
+  requests of a keep-alive connection.
+* `.RequestHandler.clear_all_cookies` now accepts ``domain`` and ``path``
+  arguments, just like `~.RequestHandler.clear_cookie`.
+* The embedded ``ca-certificats.crt`` file has been updated with the current
+  Mozilla CA list.