Merge pull request #102 from benjaoming/drop-django2.1

Remove Django 1.11 and 2.1 from setup.py

Author: benjaoming

setup.py

@@ -17,7 +17,7 @@
     keywords=["django", "notification" "alerts"],
     packages=find_packages(),
     zip_safe=False,
-    install_requires=["django>=1.11,<3.2"],
+    install_requires=["django>=2.2,<3.2"],
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'License :: OSI Approved :: GNU General Public License v3 (GPLv3)',