Update supported Python versions in setup.py

Author: cmlccie

setup.py

@@ -38,9 +38,7 @@
     "Programming Language :: Python :: 2",
     "Programming Language :: Python :: 2.7",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.5",
-    "Programming Language :: Python :: 3.6",
-    "Programming Language :: Python :: 3.7",
+    "Programming Language :: Python :: 3.10",
     "Topic :: Communications",
     "Topic :: Communications :: Chat",
 ]