Docs: force update of amqp+kombu

requirements/docs.txt

@@ -1,4 +1,4 @@
 Sphinx
 SQLAlchemy
-https://github.com/celery/py-amqp/zipball/master#egg=amqp
-https://github.com/celery/kombu/zipball/master#egg=kombu
+https://github.com/celery/py-amqp/zipball/master
+https://github.com/celery/kombu/zipball/master