Pg2pubsub 
Implementation of Pub/Sub communication between processes, local and remote, using PG2.
Installation
If available in Hex, the package can be installed as:
Add pg2pubsub to your list of dependencies in
mix.exs:def deps do
[{:pg2pubsub, "~> 0.1.0"}]end
Ensure pg2pubsub is started before your application:
def application do
[applications: [:pg2pubsub]]end