Prepare changelog

CHANGELOG.rst

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 Changelog for python-chess
 ==========================
 
+Upcoming in v1.3.4
+------------------
+
+Bugfixes:
+
+* Recover from invalid UTF-8 sent by an UCI engine, by ignoring that
+  (and only that) line.
+
+New features:
+
+* Let ``chess.pgn.GameNode.eval()`` accept PGN comments like
+  ``[%eval 2.5,11]``, meaning 250 centipawns at depth 11.
+  Use ``chess.pgn.GameNode.eval_depth()`` and
+  ``chess.pgn.GameNode.set_eval(..., depth)`` to get and set the depth.
+* Read and write PGN comments with millisecond precision
+  ``[%clk 1:23:45.678]``.
+
 New in v1.3.3
 -------------