Prepare release 6.2.0 [skip ci]

CHANGELOG

@@ -1,3 +1,5 @@
+Version 6.2.0 - 2021-11-01
+* Bug fixes (see mercurial logs for details)
 * Support grouping attribute
 * Support monetary and symbol field attributes
 * Support digits from relation field

tryton/__init__.py

@@ -1,6 +1,6 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
-__version__ = "6.1.0"
+__version__ = "6.2.0"
 import gi
 import locale