change test matrix according to `etianen/django-reversion`

.travis.yml

@@ -4,32 +4,25 @@ python:
   - 3.8
   - 3.7
   - 3.6
-  - 3.5
-  - 2.7
 cache: pip
 env:
   global:
     - PYTHONWARNINGS=default,ignore::PendingDeprecationWarning,ignore::ResourceWarning
+    - DJANGO_DATABASE_USER_POSTGRES=postgres
+    - DJANGO_DATABASE_USER_MYSQL=travis
   matrix:
+    - DJANGO='>=3.0,<3.1'
+    - DJANGO='>=2.2,<3.0'
     - DJANGO='>=2.1,<2.2'
     - DJANGO='>=2.0,<2.1'
     - DJANGO='>=1.11,<1.12'
-    - DJANGO='>=1.10,<1.11'
-    - DJANGO='>=1.9,<1.10'
-    - DJANGO='>=1.8,<1.9'
 matrix:
   fast_finish: true
   exclude:
     - python: 3.8
-      env: DJANGO='>=1.10,<1.11'
-    - python: 3.8
-      env: DJANGO='>=1.9,<1.10'
-    - python: 3.8
-      env: DJANGO='>=1.8,<1.9'
-    - python: 2.7
-      env: DJANGO='>=2.0,<2.1'
-    - python: 2.7
-      env: DJANGO='>=2.1,<2.2'
+      env: DJANGO='>=1.11,<1.12'
+    - python: 3.7
+      env: DJANGO='>=1.11,<1.12'
 addons:
   apt:
     packages:
@@ -56,7 +49,7 @@ deploy:
     secure: rzaq3pbJz25SVXyR/fn+gLaYxu0LqCEE+wcesg8pjA8cLLvFdLvXi0ZjmixxVl2u4HlndZrUgwTrRGVIQR1TOL0jGRYOUCJDzAaZqJkg+Qykz89iKSnentyOpNJe6fRAHsqFxBESYZjG8JEZvtRv+JIZLY+QR+KCA1xaeu4Afpw=
   on:
     tags: true
-    condition: $DJANGO = '>=2.0,<2.1'
+    condition: $DJANGO = '>=3.0,<3.1'
     python: 3.8
     repo: etianen/django-watson
 notifications: