Remove deprecated license classifier

Author: mgeier

setup.py

@@ -50,7 +50,6 @@
         'Framework :: Jupyter',
         'Intended Audience :: Education',
         'Intended Audience :: Science/Research',
-        'License :: OSI Approved :: MIT License',
         'Operating System :: OS Independent',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',