django22: declare django2.2 in setup and tox (#49188)

setup.py

@@ -98,7 +98,7 @@ setup(name='passerelle',
         scripts=['manage.py'],
         include_package_data=True,
         install_requires=[
-            'django >= 1.8, <1.12',
+            'django >= 1.11, <2.3',
             'django-model-utils<4',
             'requests',
             'gadjo',

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 toxworkdir = {env:TMPDIR:/tmp}/tox-{env:USER}/passerelle/{env:BRANCH_NAME:}
-envlist = py3-django111-coverage
+envlist = py3-django111-coverage,py3-django22
 
 [testenv]
 usedevelop = True
@@ -14,6 +14,7 @@ setenv =
   coverage: COVERAGE=--junitxml=junit-{envname}.xml --cov-report xml --cov-report html --cov=passerelle/ --cov-config .coveragerc -Wignore
 deps =
   django111: django>=1.11,<1.12
+  django22: django>=2.2,<2.3
   psycopg2-binary
   pytest-cov
   pytest-django