CI remove unsupported django and python versions

Author: Adil Naimi

.travis.yml

@@ -1,28 +1,14 @@
 language: python
 python:
   - "3.6"
-  - "3.5"
-  - "3.4"
-  - "3.3"
   - "2.7"
 env:
   - DJANGO_VERSION=1.11
-  - DJANGO_VERSION=1.10
-  - DJANGO_VERSION=1.9
-  - DJANGO_VERSION=1.8
 services:
   - mysql
   - postgresql
 matrix:
   exclude:
-    - python: "3.3"
-      env: DJANGO_VERSION=1.9
-    - python: "3.3"
-      env: DJANGO_VERSION=1.10
-    - python: "3.3"
-      env: DJANGO_VERSION=1.11
-    - python: "3.4"
-      env: DJANGO_VERSION=1.9
     - python: "2.7"
       env: DJANGO_VERSION=1.9
     - python: "2.7"