update classifiers

Author: amancevice

setup.py

@@ -17,6 +17,7 @@
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3.10',
         'Topic :: Utilities',
     ],
     description='Simple HTTP server to invoke a Lambda function locally',