remove license classifier

Author: drammock

setup.py

@@ -49,7 +49,6 @@ def get_tag(self):
     url='https://python-rtmixer.readthedocs.io/',
     platforms='any',
     classifiers=[
-        'License :: OSI Approved :: MIT License',
         'Operating System :: OS Independent',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',