Depend on Bunny 2.7.1+
Depend on Bunny 2.7.1+

[Release notes](https://github.com/ruby-amqp/bunny/blob/2.7.x-stable/ChangeLog.md#changes-between-bunny-270-and-271-sep-25th-2017)
Fatsoma/hutch,gocardless/hutch,gocardless/hutch,Fatsoma/hutch,Fatsoma/hutch,gocardless/hutch