Add mimic to farmbot_core

farmbot_core/mix.exs

@@ -75,6 +75,7 @@ defmodule FarmbotCore.MixProject do
       {:jason, "~> 1.1"},
       {:muontrap, "~> 0.5"},
       {:excoveralls, "~> 0.10", only: [:test], targets: [:host]},
+      {:mimic, "~> 1.1", only: [:test]},
       {:dialyxir, "~> 1.0.0-rc.3",
        only: [:dev], targets: [:host], runtime: false},
       {:ex_doc, "~> 0.21.2", only: [:dev], targets: [:host], runtime: false}