Riot: Updating the contributors list

[GianlucaGuarini]

I will update the riot.js contributors list

@rsbondi will no longer actively contribute to the project but he will be part of the riot organization as Inactive Maintainer. He will be only removed from the contributors list (thank you for your great help!!)

@rogueg he just disappeared, no answers via mail chat or issues on the repo, he will be simply moved to the Inactive Maintainers team and removed from the contributors list thank you anyway

@aMarCruz @cognitom I didn't hear any news or message from both since 6 months. They are not available via chat, mail or github so I will move both to the Inactive Maintainers team for now (and remove them from the project contributors) hoping to hear anything from them anytime soon.

side note:
I am collaborating with a friend on the riot v4 foundation and I am really excited about it. I am also open to anyone who wants to participate actively to riotjs as core contributor
✌️

[GianlucaGuarini]

closing this issue guessing nobody will complain about it 😄