Update default elixir to 1.12 and rabbitmq to 3.9.4

Hello, 



Any plans on putting in these updates soon and making elixir the default of

v 1.12? It's considered stable now. Also make otp24 the default. I tried

compiling rabbitmq 3.9.1 with it (just by changing the dep in Makefile) and

it works just fine so the updates seem fairly trivial.



Thanks!



Mike Jakubik

https://www.swiftsmsgateway.com/



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