Update project tags to remove python 3.6

Author: isra17

setup.py

@@ -76,9 +76,9 @@ def read_extras(*prefixes):
         "Operating System :: Microsoft :: Windows",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: Implementation :: CPython",
         "Programming Language :: Python :: Implementation :: PyPy",
         # uncomment if you test on these interpreters: