Add Django 2.2 environment to tests (#15)

Add Django 2.2 environment to tests

.travis.yml

@@ -1,27 +1,26 @@
 language: python
 cache: pip
+dist: trusty
+
 matrix:
   include:
   - env: TOXENV=py34-dj111
-    sudo: false
-    dist: trusty
     python: 3.4
   - env: TOXENV=py35-dj111
-    sudo: false
     dist: trusty
     python: 3.5
   - env: TOXENV=py36-dj111
-    sudo: false
-    dist: trusty
     python: 3.6
   - env: TOXENV=py37-dj2
-    sudo: true
     dist: xenial
     python: 3.7
   - env: TOXENV=py37-dj21
-    sudo: true
     dist: xenial
     python: 3.7
+  - env: TOXENV=py37-dj22
+    dist: xenial
+    python: 3.7
+
 install:
 - pip install tox codecov
 script:

CHANGELOG.rst

@@ -4,10 +4,12 @@ Changelog
 0.3 (XX.XX.XXXX) (IN DEVELOPMENT)
 ----------------------------------
 
+- Add support for Django 2.2
 - Added the ``warn_only_if_overridden`` argument to all 'value fetching' methods on ``BaseAppSettingsHelper``, which can be used to request deprecated setting values without raising the usual 'this setting is deprecated' warning, but will raise a warning if the setting is overridden.
 - Improved the consistency of error messages raised when attribute helpers or methods are called with invalid setting names, by introducing a new ``UnknownSettingNameError`` exception class and more helpful messaging.
 - Renamed ``BaseAppSettingsHelper.raise_setting_error()`` to ``_raise_setting_value_error()`` (making it a private method).
 
+
 0.2 (02.08.2018)
 ----------------
 

tox.ini

@@ -2,12 +2,12 @@
 skipsdist = True
 usedevelop = True
 
-envlist = 
-    py{34,35,36}-dj{111,2,21}
+envlist =
+    py{34,35,36}-dj{111,2,21,22}
 
 [testenv]
 install_command = pip install -e ".[testing]" -U {opts} {packages}
-commands = coverage run --source=cogwheels --omit=cogwheels/utils/* runtests.py 
+commands = coverage run --source=cogwheels --omit=cogwheels/utils/* runtests.py
 
 basepython =
     py34: python3.4
@@ -19,3 +19,4 @@ deps =
     dj111: Django>=1.11,<2.1
     dj2: Django>=2.0,<2.1
     dj21: Django>=2.1,<2.2
+    dj22: Django>=2.2,<3.0