Prepare release 6.0.0 [skip ci]

CHANGELOG

@@ -1,3 +1,5 @@
+Version 6.0.0 - 2021-05-03
+* Bug fixes (see mercurial logs for details)
 * Add support for Python 3.9
 * Unify PYSON string format
 

COPYRIGHT

@@ -1,5 +1,5 @@
-Copyright (C) 2010-2020 Cédric Krier.
-Copyright (C) 2010-2020 B2CK SPRL.
+Copyright (C) 2010-2021 Cédric Krier.
+Copyright (C) 2010-2021 B2CK SPRL.
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU Lesser General Public License as published by

proteus/__init__.py

@@ -10,7 +10,7 @@ from decimal import Decimal
 
 import proteus.config
 
-__version__ = "5.9.0"
+__version__ = "6.0.0"
 __all__ = ['Model', 'Wizard', 'Report']
 
 _MODELS = threading.local()