Fix invalid license setup.py classifier (django-json-api#484)

Author: sliverc

setup.py

@@ -71,7 +71,7 @@ def get_package_data(package):
     name='djangorestframework-jsonapi',
     version=get_version('rest_framework_json_api'),
     url='https://github.com/django-json-api/django-rest-framework-json-api',
-    license='MIT',
+    license='BSD',
     description='A Django REST framework API adapter for the JSON API spec.',
     long_description=read('README.rst'),
     author='Jerel Unruh',
@@ -83,7 +83,7 @@ def get_package_data(package):
         'Environment :: Web Environment',
         'Framework :: Django',
         'Intended Audience :: Developers',
-        'License :: OSI Approved :: MIT License',
+        'License :: OSI Approved :: BSD License',
         'Operating System :: OS Independent',
         'Programming Language :: Python',
         'Programming Language :: Python :: 2',