Prepare release 6.0.0 [skip ci]

CHANGELOG

@@ -1,3 +1,6 @@
+Version 6.0.0 - 2021-05-03
+* Bug fixes (see mercurial logs for details)
+
 Version 5.8.0 - 2020-11-02
 * Bug fixes (see mercurial logs for details)
 * Remove support for Python 3.5

COPYRIGHT

@@ -1,4 +1,4 @@
-Copyright (C) 2018-2020 Cédric Krier
+Copyright (C) 2018-2021 Cédric Krier
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by

tryton.cfg

@@ -1,5 +1,5 @@
 [tryton]
-version=5.9.0
+version=6.0.0
 depends:
     ir
     res