update trove classifiers

Author: joshuadavidthomas

setup.py

@@ -37,6 +37,7 @@ def read(*names, **kwargs):
 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 :: Quality Assurance