Recommend Bintray for signing key downloads
Recommend Bintray for signing key downloads

See https://github.com/rabbitmq/erlang-rpm/issues/57 for context.

(cherry picked from commit abeedb4188a8dc420f7a2e7125ded28cb4e158e4)

rabbitmq/rabbitmq-website,rabbitmq/rabbitmq-website,rabbitmq/rabbitmq-website,rabbitmq/rabbitmq-website,rabbitmq/rabbitmq-website