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)
 * Use appropriate types for email and url widgets
 * Add completion on xxx2Many and Dict
 * Add attachment preview

COPYRIGHT

@@ -1,7 +1,7 @@
-Copyright (C) 2012-2020 Nicolas Évrard.
-Copyright (C) 2012-2020 Cédric Krier.
+Copyright (C) 2012-2021 Nicolas Évrard.
+Copyright (C) 2012-2021 Cédric Krier.
 Copyright (C) 2012-2014 Bertrand Chenal.
-Copyright (C) 2012-2020 B2CK SPRL.
+Copyright (C) 2012-2021 B2CK SPRL.
 Copyright (C) 2019 Jitbit.
 Copyright (C) 2013 Thomas Park
 Copyright (C) 2020 Maxime Richez

package.json

@@ -2,7 +2,7 @@
   "name": "tryton-sao",
   "title": "sao",
   "description": "Tryton webclient",
-  "version": "5.9.0",
+  "version": "6.0.0",
   "homepage": "http://www.tryton.org/",
   "author": {
     "name": "Tryton"