Update test matrix notation with ~= versions

.travis.yml

@@ -4,21 +4,24 @@ python:
 - 2.7
 - 3.6
 env:
-- DJANGO="django>=1.8.0,<1.9.0"
-- DJANGO="django>=1.9.0,<1.10.0"
-- DJANGO="django>=1.10.0,<1.11.0"
-- DJANGO="django>=1.11.0,<1.12.0"
-- DJANGO="django>=2.0,<2.1"
-- DJANGO="django>=2.1,<2.2"
-- DJANGO="django>=2.2,<2.3"
+- DJANGO="django~=1.8"
+- DJANGO="django~=1.9"
+- DJANGO="django~=1.10"
+- DJANGO="django~=1.11"
+- DJANGO="django~=2.0"
+- DJANGO="django~=2.1"
+- DJANGO="django~=2.2"
+- DJANGO="django~=3.0"
 matrix:
   exclude:
   - python: 2.7
-    env: DJANGO="django>=2.0,<2.1"
+    env: DJANGO="django~=2.0"
   - python: 2.7
-    env: DJANGO="django>=2.1,<2.2"
+    env: DJANGO="django~=2.1"
   - python: 2.7
-    env: DJANGO="django>=2.2,<2.3"
+    env: DJANGO="django~=2.2"
+  - python: 2.7
+    env: DJANGO="django~=3.0"
 before_install:
 - pip install codecov
 install:

tox.ini

 [tox]
 envlist=
     py27-django{18,19,110,111},
-    py36-django{18,19,110,111},
-    py36-django{20},
-    py36-django{21},
-    py36-django{22},
+    py36-django{18,19,110,111,20,21,22,30},
     # py36-django-dev,
     coverage,
 
@@ -16,13 +13,14 @@ deps =
 [testenv]
 deps =
     {[base]deps}
-    django18: Django >= 1.8,<1.9
-    django19: Django >= 1.9,<1.10
-    django110: Django >= 1.10,<1.11
-    django111: Django >= 1.11,<1.12
-    django20: Django >= 2.0,<2.1
-    django21: Django >= 2.1,<2.2
-    django22: Django >= 2.2,<2.3
+    django18: Django ~= 1.8
+    django19: Django ~= 1.9
+    django110: Django ~= 1.10
+    django111: Django ~= 1.11
+    django20: Django ~= 2.0
+    django21: Django ~= 2.1
+    django22: Django ~= 2.2
+    django30: Django ~= 3.0
     django-dev: https://github.com/django/django/tarball/master
 commands=
     python runtests.py