BLD: update Python support metadata in setup.py

Author: tacaswell

setup.py

@@ -24,13 +24,11 @@
       platforms='Cross platform (Linux, Mac OSX, Windows)',
       license="BSD",
       classifiers=['Development Status :: 4 - Beta',
-                   'Programming Language :: Python :: 2',
-                   'Programming Language :: Python :: 2.6',
-                   'Programming Language :: Python :: 2.7',
                    'Programming Language :: Python :: 3',
-                   'Programming Language :: Python :: 3.3',
-                   'Programming Language :: Python :: 3.4',
-                   'Programming Language :: Python :: 3.5',
+                   'Programming Language :: Python :: 3.7',
+                   'Programming Language :: Python :: 3.8',
+                   'Programming Language :: Python :: 3.9',
+                   'Programming Language :: Python :: 3.10',
                    ],
       long_description=descr,
       )