Indentation of parameters when no parenthesis are used

``` elixir
defmodule MyMailer do
  use Mailgun.Client, domain: Application.get_env(:my_app, :mailgun_domain),
  key: Application.get_env(:my_app, :mailgun_key)
end
```

should the line starting with `key: ...` be indented one more level? the same happens in config files generated by phoenix. 
