fix: typo

Author: Zxilly

setup.py

@@ -36,9 +36,12 @@
     classifiers=[
         "Development Status :: 3 - Alpha",
         "Intended Audience :: Developers",
+        "Programming Language :: Python :: 3 :: Only",
         "Programming Language :: Python :: 3",
         "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",
         "Operating System :: OS Independent",
     ],