Merge pull request #18 from singular-labs/classifiers

Add classifiers to setup file to show support for py2 and py3

Author: keren-meron

setup.py

@@ -26,5 +26,13 @@
         'pytz',
         'retrying',
     ],
-    extras_require={':python_version == "2.7"': ['futures']}
+    extras_require={':python_version == "2.7"': ['futures']},
+    classifiers=[
+        'Programming Language :: Python',
+        'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
+    ]
 )