Trying conditional build install override

.travis.yml

@@ -11,6 +11,9 @@ install:
     pip install -e .[test]
     pip install psycopg2 # Required for Django postgres fields testing
     pip install django==$DJANGO_VERSION
+    if [ $DJANGO_VERSION = 1.8 ]; then # DRF dropped 1.8 support at 3.7.0
+      pip install djangorestframework==3.6.4
+    fi
     python setup.py develop
   elif [ "$TEST_TYPE" = lint ]; then
     pip install flake8

setup.py

@@ -10,7 +10,7 @@ with open('graphene_django/__init__.py', 'rb') as f:
         f.read().decode('utf-8')).group(1)))
 
 rest_framework_require = [
-    'djangorestframework>=3.6.3,<3.7.0',
+    'djangorestframework>=3.6.3',
 ]