Prepare release 6.4.0 [skip ci]

CHANGELOG

@@ -1,3 +1,5 @@
+Version 6.4.0 - 2022-05-02
+* Bug fixes (see mercurial logs for details)
 * Remove 61 tax code no more used in AEAT303
 * Include 120, 122, 123 and 124 new keys in model 303 format
 * Add support for Python 3.10

COPYRIGHT

@@ -1,4 +1,4 @@
-Copyright (C) 2017-2021 Sergi Almacellas Abellana
+Copyright (C) 2017-2022 Sergi Almacellas Abellana
 Copyright (C) 2013-2016 Zikzakmedia SL.
 
 This program is free software: you can redistribute it and/or modify

tryton.cfg

@@ -1,5 +1,5 @@
 [tryton]
-version=6.3.0
+version=6.4.0
 depends:
     company
     currency