fix: support python 3.10 (#499)

* fix: support python 3.10

Author: Noah

.github/workflows/cicd.yml

@@ -35,7 +35,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest]
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: ['3.6', '3.7', '3.8', '3.9', '3.10.0-beta.1']
       fail-fast: false
     steps:
       - uses: actions/checkout@v2

setup.py

@@ -86,6 +86,7 @@ def version_scheme(v):
             "Programming Language :: Python :: 3.7",
             "Programming Language :: Python :: 3.8",
             "Programming Language :: Python :: 3.9",
+            "Programming Language :: Python :: 3.10",
             "Topic :: Software Development :: Libraries",
             "Topic :: Software Development :: Testing",
         ],