Update supported python versions

Author: jan-janssen

setup.py

@@ -16,10 +16,11 @@
                  'License :: OSI Approved :: BSD License',
                  'Intended Audience :: Science/Research',
                  'Operating System :: OS Independent',
-                 'Programming Language :: Python :: 3.6',
                  'Programming Language :: Python :: 3.7',
                  'Programming Language :: Python :: 3.8',
-                 'Programming Language :: Python :: 3.9'
+                 'Programming Language :: Python :: 3.9',
+                 'Programming Language :: Python :: 3.10',
+                 'Programming Language :: Python :: 3.11'
                 ],
 
     keywords='lammps, mpi4py',