LISTEN and NOTIFY doesn't work

[robsonpeixoto]

The notification is not sent to the client who is listening to a channel.

Code to show the error: https://github.com/robsonpeixoto/azure-postgresql-listen-notify-bug

Affected users:

• commanded/eventstore#126
• elixir-ecto/postgrex#375
• subzerocloud/pg-amqp-bridge#13

Products that will be affected:

• graphile/crystal#92