Fail to connect to RabbitMQ and causing resource leak

[pauldeng]

Hi,

Thanks for the plugin.

Issue
I am starting to use latest RabbitMQ v3.12.2 Erlang v26.0.2 with this plugin v2.4.2 and notice an issue:

• failed to connect
• keeps re-trying to connect to server and generating a lot of connections which can be seen on RabbitMQ web interface Connections tab.
  
• in the end use all memory and hang
• this issue is not seen in RabbitMQ v3.10.x and this plugin v2.4.2

Workaround
Simply upgrade amqplib to latest seems fixed this issue and here is already a PR #70 for it (needs a bit of massage).

I will leave it to the community and repo owner to progress.

Cheers,
Paul