feat: add support for python 3.10 (#1557)

diff --git a/setup.py b/setup.py
index 45ec04d..48e811a 100644
--- a/setup.py
+++ b/setup.py
@@ -74,6 +74,7 @@
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
         "Development Status :: 5 - Production/Stable",
         "Intended Audience :: Developers",
         "License :: OSI Approved :: Apache Software License",