Update test matrix and how tests are started on Travis

.travis.yml

@@ -1,18 +1,21 @@
 sudo: false
 language: python
 python:
-  - "2.7"
-  - "3.3"
-  - "3.4"
   - "3.5"
+  - "3.6"
 env:
-  - DJANGO='Django>=1.7,<1.8' SKIP='2.6 3.5'
-  - DJANGO='Django>=1.8,<1.9' SKIP='2.6'
-  - DJANGO='Django>=1.9,<1.10' SKIP='2.6 3.3'
-  - DJANGO='Django>=1.10,<1.11' SKIP='2.6 3.3'
+  - DJANGO="1.11,<2.0"
+  - DJANGO="2.0,<3.0"
+matrix:
+  include:
+    - python: 2.7
+      env: DJANGO="1.11,<2.0"
+
 install:
-  scripts/travis-install.sh
+  - pip install coverage coveralls
+  - pip install "Django>=$DJANGO"
+  - pip install git+https://github.com/landscapeio/pylint-plugin-utils.git@master
 script:
-  scripts/travis-build.sh
+  - PYTHONPATH=. coverage run test/test_func.py
 after_success:
   coveralls