Remove unused Asciinema.Users.Mailer module

lib/asciinema/users/mailer.ex

@@ -1,19 +0,0 @@
-defmodule Asciinema.Users.Mailer do
-  @doc "Sends registration email to given address"
-  @callback send_register_email(email_address :: String.t, register_url :: String.t) :: :ok | {:error, term}
-
-  @doc "Sends login email to given address"
-  @callback send_login_email(email_address :: String.t, login_url :: String.t) :: :ok | {:error, term}
-
-  def send_register_email(email_address, register_url) do
-    instance().send_register_email(email_address, register_url)
-  end
-
-  def send_login_email(email_address, login_url) do
-    instance().send_login_email(email_address, login_url)
-  end
-
-  defp instance do
-    Application.get_env(:asciinema, :mailer)
-  end
-end