Steal a section on iterative reviews from `rabbitmqadmin-ng` and RabbitMQ server's instructions

Release instructions: this repo does not prefix tags with a 'v'

Release instructions: avoid pushing older tags

Bump dev version

3.1.0

Change log updates

Rework connection recovery spec

Introduce a new channel state: recovering

Explicitly mark channel as closed when detecting connection failure

Make `connection_recovery_spec` even less prone to flakes

Run `Bunny::Channel#on_error` in a separate thread

.gemspec: bump required Ruby minimum #731

Publisher Confirms-related doc updates

Correct a change log example

Back to dev version