Add extra Python versions to metadata. (#1173)

Author: corranwebster

setup.py

@@ -321,6 +321,9 @@ def resolve_version():
               Programming Language :: Python :: 3.6
               Programming Language :: Python :: 3.7
               Programming Language :: Python :: 3.8
+              Programming Language :: Python :: 3.9
+              Programming Language :: Python :: 3.10
+              Programming Language :: Python :: 3.11
               Topic :: Scientific/Engineering
               Topic :: Software Development
               Topic :: Software Development :: Libraries