ExUnitNotifier.handle_event/2 is undefined or private

[rkmax]

Today I just installed

1. add dependency {:ex_unit_notifier, "~> 0.1", only: :test}
2. add to test_helper.exs ExUnit.configure formatters: [ExUnit.CLIFormatter, ExUnitNotifier]
3. add to config/test.exs config :ex_unit_notifier, notifier: ExUnitNotifier.Notifiers.NotifySend neither it's working with default
4. mix test.watch

I'm using:

• erlang 19.3
• elixir 1.3

and got this

11:55:00.139 [error] GenEvent handler ExUnitNotifier installed in #PID<0.1123.0> terminating
** (UndefinedFunctionError) function ExUnitNotifier.handle_event/2 is undefined or private. Did you mean one of:

      * handle_cast/2
      * handle_info/2