Merge pull request #75 from HBS-HBX/esmail-patch-1

Prevent installation on incompatible Python versions

Author: esmail

setup.py

@@ -55,6 +55,7 @@ def get_version(*file_paths):
     ],
     zip_safe=False,
     keywords='Django Elasticsearch',
+    python_requires=">=3.6, <=4.0",
     classifiers=[
         'Development Status :: 4 - Beta',
         'Framework :: Django',