exclude cover files

mix.exs

@@ -7,6 +7,7 @@ defmodule FeedReader.MixProject do
       version: "0.1.0",
       elixir: "~> 1.20.4",
       elixirc_paths: elixirc_paths(Mix.env()),
+      test_coverage: [ignore_modules: [~r/^FeedReader\.TestSupport\./]],
       start_permanent: Mix.env() == :prod,
       aliases: aliases(),
       deps: deps()