FEATURE: adjust setup metadata (#23)

setup.py

@@ -40,7 +40,9 @@
     version=__version__,
     author='Divio AG',
     author_email='[email protected]',
-    url='http://github.com/divio/djangocms-transfer',
+    maintainer='Django CMS Association and contributors',
+    maintainer_email='[email protected]',
+    url='https://github.com/django-cms/djangocms-transfer',
     license='BSD-3-Clause',
     description='Adds import and export of plugin data.',
     long_description=open('README.rst').read(),