add django 1.8 in travis

Author: nikolas

.travis.yml

@@ -11,6 +11,7 @@ env:
   - DJANGO="Django>=1.5.0,<1.6.0"
   - DJANGO="Django>=1.6.0,<1.7.0"
   - DJANGO="Django>=1.7.0,<1.8.0"
+  - DJANGO="Django>=1.8.0,<1.9.0"
 matrix:
   exclude:
     - python: "3.2"
@@ -22,6 +23,8 @@ matrix:
 
     - python: "2.6"
       env: DJANGO="Django>=1.7.0,<1.8.0"
+    - python: "2.6"
+      env: DJANGO="Django>=1.8.0,<1.9.0"
 install:
   - pip install -e .
   - travis_retry pip install $DJANGO django-discover-runner sqlparse