Add Python 3.6 tag

Author: vyzyv

setup.py

@@ -29,6 +29,7 @@ def read(HERE: pathlib.Path, filename, variable):
         "Development Status :: 2 - Pre-Alpha",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "License :: OSI Approved :: MIT License",
         "Intended Audience :: Developers",