Add: some classifiers for python versions (#49)

* Add: some classifiers for python versions

Author: eggplants

setup.py

@@ -51,6 +51,7 @@
     include_package_data=True,
     classifiers=(
         "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3.7",
         "License :: OSI Approved :: GNU Affero General Public License v3 or later (AGPLv3+)",
         "Operating System :: OS Independent",
     ),