Prepare release of v0.12.1

Author: niklasf

CHANGELOG.rst

@@ -6,9 +6,20 @@ is more important to get things right, than to be consistent with previous
 versions. Use this changelog to see what changed in a new release, because this
 might include API breaking changes.
 
+New in v0.12.1
+--------------
+
+Changes:
+
+* Robust handling of invalid castling rights. You can also use the new
+  method `Board.clean_castling_rights()` to get the subset of strictly valid
+  castling rights.
+
 New in v0.12.0
 --------------
 
+New features:
+
 * Python 2.6 support. Patch by vdbergh.
 
 * Pure Python Gaviota tablebase probing. Thanks to Jean-Noël Avila.

chess/__init__.py

@@ -20,7 +20,7 @@
 
 __email__ = "niklas.fiekas@tu-clausthal.de"
 
-__version__ = "0.12.0"
+__version__ = "0.12.1"
 
 import copy
 import re