Python 3.7 compatibility

setup.py

@@ -10,6 +10,7 @@ setuptools.setup(
 		'Development Status :: 3 - Alpha',
 		'License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)',
 		'Programming Language :: Python :: 3.6',
+		'Programming Language :: Python :: 3.7',
 	],
 	packages = ['qwarc'],
 	setup_requires = ['setuptools_scm'],