minor fix for classifiers

Author: Chilipp

setup.py

@@ -19,7 +19,7 @@ def readme():
         'Development Status :: 5 - Production/Stable',
         'Intended Audience :: Developers',
         'Topic :: Documentation',
-        'License :: OSI Approved :: GNU General Public License v2 (GPLv2)',
+        'License :: OSI Approved :: Apache Software License',
         'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3 :: Only',
         'Programming Language :: Python :: 3.5',