fix package url

Author: kzk

setup.py

@@ -16,7 +16,7 @@
   install_requires=['msgpack-python'],
   author='Kazuki Ohta',
   author_email='[email protected]',
-  url='https://github.com/kzk/fluent-logger-python',
+  url='https://github.com/fluent/fluent-logger-python',
   download_url='http://pypi.python.org/pypi/fluent-logger/',
   license='Apache License, Version 2.0',
   classifiers=[