Private init

[angeldev]

Hi, first of all thanks you very much for this repo, I found it very useful. Just, I wonder if class constant approach could be incomplete. Isn't necessary a private init? with this current implementation you could create several references of the same class, with a private init you only could create one instance (the static property).

Thanks.

[gabrielmadruga]

You are correct, in fact the .swift example is already updated. I made a pull request for this: #14