basic_publish allows str type

[baodrate]

basic_publish's body parameter, e.g.:

https://github.com/qubidt/pika-stubs/blob/a0e7b336e6b2f9a9bcde347725b9348871096080/pika-stubs/adapters/blocking_connection.pyi#L184-L191

or

https://github.com/qubidt/pika-stubs/blob/a0e7b336e6b2f9a9bcde347725b9348871096080/pika-stubs/channel.pyi#L110-L117

allows a str argument, per pika code:

   def basic_publish(self,
                     exchange,
                     routing_key,
                     body,
                     properties=None,
                     mandatory=False):
       """Publish to the channel with the given exchange, routing key and body.
       For more information on basic_publish and what the parameters do, see:

       http://www.rabbitmq.com/amqp-0-9-1-reference.html#basic.publish

       :param str exchange: The exchange to publish to
       :param str routing_key: The routing key to bind on
       :param bytes body: The message body
       :param pika.spec.BasicProperties properties: Basic.properties
       :param bool mandatory: The mandatory flag

       """
       self._raise_if_not_open()
       if isinstance(body, unicode_type):
           body = body.encode('utf-8')
       properties = properties or spec.BasicProperties()
       ...

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Copied from hahow/pika-stubs/issues/8