[fix #48160213] downgraded bunny gem to 0.8.0 version
Merge pull request #165 from ke4/master_48160213_downgrade_bunny_gem_to_the_latest_stabil_version__0_8_0__

[fix #48160213] downgraded bunny gem to 0.8.0 version
[fix #48240295] set heartbeat option on RabbitMQ

We have to set it to the same value on server and
client, too.
Merge pull request #168 from ke4/bunny_0_9_with_heartbeat_0

[fix #48240295] set heartbeat option on RabbitMQ