Fix classifier in setup.py

setup.py

@@ -87,7 +87,6 @@ setup(
         'Development Status :: 5 - Production/Stable',
         'Intended Audience :: Developers',
         'Natural Language :: English',
-        'License :: OSI Approved :: GPLv3 License',
         'Programming Language :: Python',
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 3',