test on 3.10 and 3.11. Also fix command

Signed-off-by: Sylvain Hellegouarch <sh@defuze.org>

Author: Lawouach

tox.ini

@@ -4,10 +4,10 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py27,py36,py37,py38,py39
+envlist = py27,py36,py37,py38,py39,py310,py311
 
 [testenv]
-commands = python setup.py test
+commands = pytest
 deps =
     py27: -r requirements/py2kreqs.txt
-    {py36,py37,py38,py39}: -r requirements/py3kreqs.txt
+    {py36,py37,py38,py39,py310,py311}: -r requirements/py3kreqs.txt