Update the README to point to rabbitmq.org's nice list of other Python clients.
Update the README to point to rabbitmq.org's nice list of other Python clients.

jonahbull/py-amqp,newvem/py-amqplib,smurfix/aio-py-amqp,dims/py-amqp,yetone/py-amqp,dims/py-amqp,dallasmarlow/py-amqp,smurfix/aio-py-amqp,jonahbull/py-amqp,yetone/py-amqp,dallasmarlow/py-amqp