change in setup.py from BSD to MIT to match LICENSE file (#467)

Author: csreesan

setup.py

@@ -102,7 +102,7 @@ def run(self):
         'Development Status :: 5 - Production/Stable',
         'Framework :: Pytest',
         'Intended Audience :: Developers',
-        'License :: OSI Approved :: BSD License',
+        'License :: OSI Approved :: MIT License',
         'Operating System :: Microsoft :: Windows',
         'Operating System :: POSIX',
         'Operating System :: Unix',