Reverted requires rest framework version to support 2.X.X backward compatibility

Author: Eric Honkanen

setup.py

@@ -16,7 +16,7 @@ def get_readme():
     license='BSD',
     keywords="EmberJS Django REST",
     packages=find_packages(),
-    install_requires=['django', 'djangorestframework >= 3.0.0', 'inflection' ],
+    install_requires=['django', 'djangorestframework >= 2.4.0', 'inflection' ],
     platforms=['any'],
     classifiers=[
         'Development Status :: 4 - Beta',