add support for groups

[grandeljay]

Please correct me if I am wrong, but it seems like it's not possible to fetch groups via the ApiManager.

[rdoepner]

Hello, there are some library forks. Maybe one of them implemented this feature.

See: https://github.com/fabianmu/cleverreach

[grandeljay]

Neat thanks!

I can see @fabianmu created a PR (#11) with the changes from his fork, can you merge them, please?

[grandeljay]

If you don't have the time or simply don't want to maintain this repository any more, I'd be willing to do my best to continue working on this. I think you've done some great work here and it would be a shame to leave things how they are now.

It just pains me to see different forks, all with different features. IMO it'd be best to have everything in one repository.