Add Django 2.2 to test suite

.gitlab-ci.yml

@@ -9,14 +9,14 @@ before_script:
 test_python:3.5:
   stage: test
   image: python:3.5
-  script: tox -e 'py35-django{111,200,210}'
+  script: tox -e 'py35-django{111,200,210,220}'
 
 test_python:3.6:
   stage: test
   image: python:3.6
-  script: tox -e 'py36-django{111,200,210}'
+  script: tox -e 'py36-django{111,200,210,220}'
 
 test_python:3.7:
   stage: test
   image: python:3.7
-  script: tox -e 'py37-django{200,210}'
+  script: tox -e 'py37-django{200,210,220}'

tox.ini

 [tox]
 toxworkdir={env:TOX_WORK_DIR:.tox}
-envlist = py{35,36,37}-django{111,200,210}
+envlist = py{35,36,37}-django{111,200,210,220}
 
 [testenv]
 extras = development
@@ -8,6 +8,7 @@ deps =
     django111: django>=1.11,<1.12
     django200: django>=2.0,<2.1
     django210: django>=2.1,<2.2
+    django220: django>=2.2,<2.3
 commands =
     flake8 src sandbox setup.py
-    {envpython} {toxinidir}/sandbox/manage.py test soap
+    {envpython} -Wd {toxinidir}/sandbox/manage.py test soap