Consistent Python versions (#1136)

Author: DimitriPapadopoulos

setup.py

@@ -47,9 +47,9 @@
         'Topic :: Software Development :: Libraries :: Python Modules',
         'Operating System :: Unix',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3.10',
     ],
     maintainer='Alistair Miles',
     maintainer_email='alimanfoo@googlemail.com',