Prepare release 5.6.0 [skip ci]

CHANGELOG

@@ -1,3 +1,5 @@
+Version 5.6.0 - 2020-05-04
+* Bug fixes (see mercurial logs for details)
 * Add configuration value for frequency
 * Use fixed year of 365 days
 

COPYRIGHT

@@ -1,7 +1,7 @@
 Copyright (C) 2012-2017 Nicolas Évrard.
-Copyright (C) 2012-2019 Cédric Krier.
+Copyright (C) 2012-2020 Cédric Krier.
 Copyright (C) 2012-2013 Bertrand Chenal.
-Copyright (C) 2012-2019 B2CK SPRL.
+Copyright (C) 2012-2020 B2CK SPRL.
 
 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=5.5.0
+version=5.6.0
 depends:
     ir
     res