Add runtime support: don't only listen on /tmp/frajtano1, script to add peer

mix.exs

@@ -14,6 +14,7 @@ defmodule Frajtano.MixProject do
   def application do
     [
       extra_applications: [:logger],
+      env: [listen_path: nil],
       mod: {Frajtano, []}
     ]
   end