Rework test matrix and structure

.travis.yml

@@ -1,42 +1,46 @@
 language: python
 
-python:
-  - 2.6
-  - 2.7
-  - 3.2
-  - 3.3
-  - 3.4
+matrix:
+  fast_finish: true
+  allow_failures:
+    - env: DJANGO=master
+  include:
+    - python: 2.7
+      env: DJANGO=1.11
 
-env:
-  - DJANGO_VERSION=1.4 MODULE=jsignature
-  - DJANGO_VERSION=1.5 MODULE=jsignature
-  - DJANGO_VERSION=1.6 MODULE=jsignature.tests
-  - DJANGO_VERSION=1.7 MODULE=jsignature.tests
+    - python: 3.5
+      env: DJANGO=1.11
+    - python: 3.5
+      env: DJANGO=2.2
+
+    - python: 3.6
+      env: DJANGO=1.11
+    - python: 3.6
+      env: DJANGO=2.2
+    - python: 3.6
+      env: DJANGO=3.0
+    - python: 3.6
+      env: DJANGO=master
+
+    - python: 3.7
+      env: DJANGO=2.2
+    - python: 3.7
+      env: DJANGO=3.0
+    - python: 3.7
+      env: DJANGO=master
+
+
+    - python: 3.8
+      env: DJANGO=2.2
+    - python: 3.8
+      env: DJANGO=3.0
+    - python: 3.8
+      env: DJANGO=master
 
 install:
-  - pip install -r requirements.txt --use-mirrors
-  - pip install -q Django==$DJANGO_VERSION --use-mirrors
-  - pip install coverage
-
-script: coverage run quicktest.py $MODULE
-
+  - pip install tox tox-travis
+script:
+  - tox
 after_success:
- - pip install coveralls
- - coveralls
-
-# We need to exclude old versions of Django for tests with python 3.
-# We need to exclude old versions of Python for tests with Django >= 1.7.
-matrix:
-    exclude:
-        - python: 3.2
-          env: DJANGO_VERSION=1.4 MODULE=jsignature
-        - python: 3.3
-          env: DJANGO_VERSION=1.4 MODULE=jsignature
-        - python: 3.4
-          env: DJANGO_VERSION=1.4 MODULE=jsignature
-        - python: 3.4
-          env: DJANGO_VERSION=1.5 MODULE=jsignature
-        - python: 3.4
-          env: DJANGO_VERSION=1.6 MODULE=jsignature.tests
-        - python: 2.6
-          env: DJANGO_VERSION=1.7 MODULE=jsignature.tests
+  - pip install coveralls
+  - coveralls