Python 3.10 support

Author: elprans

.github/workflows/tests.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9]
+        python-version: [3.7, 3.8, 3.9, 3.10.0-rc.1]
         os: [ubuntu-latest, macos-latest]
 
     steps:

setup.py

@@ -311,6 +311,7 @@ def build_extensions(self):
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3.10',
         'License :: OSI Approved :: Apache Software License',
         'License :: OSI Approved :: MIT License',
         'Intended Audience :: Developers',