Network Programming in Elixir and Erlang B5.0: missing introduciton of module for Connection

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Title: Network Programming in Elixir and Erlang: B4.0
Chapter 2

It would be good to add a text block before Connection.start_link/1 on page 19 with the top of that module. It’s not hard to figure out, but I thought I had missed something.

defmodule TCPEchoServer.Connection do
  use GenServer

  require Logger