chore: Include Req for Livebook use

mix.exs

@@ -67,7 +67,8 @@ defmodule Medicode.MixProject do
       {:membrane_raw_audio_format, "~> 0.12.0"},
       {:kino, "~> 0.12.3"},
       {:csv, "~> 3.2"},
-      {:chromic_pdf, "~> 1.15"}
+      {:chromic_pdf, "~> 1.15"},
+      {:req, "~> 0.4.0"}
       # {:membrane_portaudio_plugin, "~> 0.18.0"}
     ]
   end