Update DRF version in CI

Author: Ryan P Kilby

.travis.yml

@@ -8,10 +8,10 @@ python:
   - "3.4"
   - "3.5"
 env:
-  - DJANGO="django>=1.10.0,<1.11.0" REST_FRAMEWORK="djangorestframework>=3.4,<3.5"
-  - DJANGO="django>=1.9.0,<1.10.0" REST_FRAMEWORK="djangorestframework>=3.4,<3.5"
+  - DJANGO="django>=1.10.0,<1.11.0" REST_FRAMEWORK="djangorestframework>=3.5,<3.6"
+  - DJANGO="django>=1.9.0,<1.10.0" REST_FRAMEWORK="djangorestframework>=3.5,<3.6"
+  - DJANGO="django>=1.8.0,<1.9.0" REST_FRAMEWORK="djangorestframework>=3.5,<3.6"
   - DJANGO="django>=1.8.0,<1.9.0" REST_FRAMEWORK="djangorestframework>=3.4,<3.5"
-  - DJANGO="django>=1.8.0,<1.9.0" REST_FRAMEWORK="djangorestframework>=3.3,<3.4"
 install:
   - travis_retry pip install -q $DJANGO $REST_FRAMEWORK "coverage==3.7.1"
   - pip install .
@@ -24,7 +24,7 @@ after_success:
 matrix:
   exclude:
     - python: "3.3"
-      env: DJANGO="django>=1.10.0,<1.11.0" REST_FRAMEWORK="djangorestframework>=3.4,<3.5"
+      env: DJANGO="django>=1.10.0,<1.11.0" REST_FRAMEWORK="djangorestframework>=3.5,<3.6"
     - python: "3.3"
-      env: DJANGO="django>=1.9.0,<1.10.0" REST_FRAMEWORK="djangorestframework>=3.4,<3.5"
+      env: DJANGO="django>=1.9.0,<1.10.0" REST_FRAMEWORK="djangorestframework>=3.5,<3.6"
   fast_finish: true