fix a bug that causes error message not correctly displayed when running `mix appsignal.install` (#550)
fix a bug that causes error message not correctly displayed when running `mix appsignal.install` (#550)


appsignal/appsignal-elixir,appsignal/appsignal-elixir,appsignal/appsignal-elixir,appsignal/appsignal-elixir