Update .travis.yml

Author: scuml

.travis.yml

@@ -1,14 +1,11 @@
 language: python
 python:
-  - 2.7
-  - 3.5
   - 3.8
 env:
   global:
     - DJANGO_SETTINGS_MODULE=tests.settings
   matrix:
     - DJANGO=2.2
-    - DJANGO=3.0
 install:
   - pip install -q Django==$DJANGO django-debug-toolbar>=1.0
 script: python -m tests.test_toolbar