do not constraints to django max version

setup.py

@@ -34,7 +34,7 @@ setup(
     platforms=['OS Independent'],
     classifiers=CLASSIFIERS,
     install_requires=[
-        'Django>=1.8,<=1.12',
+        'Django>=1.8',
     ],
     packages=find_packages(exclude=['project', 'project.*']),
     include_package_data=True,