Updates versioneer for Python 3.11 and updated supported versions and tests

Author: oscargus

.github/workflows/tests.yml

@@ -55,9 +55,10 @@ jobs:
     strategy:
       matrix:
         python-version:
-          - 3.6
           - 3.7
           - 3.8
+          - 3.9
+          - '3.10'
           - pypy3
     steps:
     - uses: actions/checkout@v2

setup.py

@@ -32,9 +32,10 @@
         "Operating System :: OS Independent",
         "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 :: 3.10",
         "Programming Language :: Python :: Implementation :: CPython",
         "Programming Language :: Python :: Implementation :: PyPy",
         "Topic :: Software Development :: Libraries",