fix classifier

Author: shmir

setup.cfg

@@ -18,7 +18,7 @@ classifiers =
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
-    Programming Language :: Python :: 3.10"
+    Programming Language :: Python :: 3.10
 
 [options]
 zip_safe = False