Add JMM PlexPlugin to the UnsupportedAppStore

[CatmanIX]

UAS is a plugin for plex that adds a secondary "appstore" for finding and installing 3rd party plugins not officially supported by Plex (ie: this one). this would make it easier for users to install and update this plugin from within plex.

Information on how to get it added to the UAS can be found here. It doesn't really require much doing.

More information about UAS can be found here and here on the Plex forums.

[maxpiva]

Will do, in the next version :)