Add sentry to sponsors

[razzeee]

If we end up using sentry for the website they would like to be named somewhere.

p.s. We’d appreciate if you’d tell your friends, or maybe toss up a Sentry link in your app to help us spread the word! You can always find high quality copies of our logo on our Branding page (https://sentry.io/branding/).

[pkscout]

There is a CMS area for sponsors. Any new sponsor can be added there. During the next build all the places sponsors are listed will be updated.

https://github.com/xbmc/kodi-tv/wiki/Sponsors