add 3rd-party service warning for cloudtunes

requires access to youtube/dropbox

README.md

@@ -608,7 +608,7 @@ See also <https://en.wikipedia.org/wiki/List_of_streaming_media_systems>, <https
   * [Airtime](https://www.sourcefabric.org/en/airtime/) - Simple, open source platform that lets you broadcast streaming radio on the web. [Source Code](https://github.com/sourcefabric/Airtime) `AGPLv3` `PHP`
   * [Ampache](http://ampache.org/) - A web based audio/video streaming application. ([Demo](http://play.dogmazic.net/), [Source Code](https://github.com/ampache/ampache)) `AGPLv3` `PHP`
   * [CherryMusic](http://www.fomori.org/cherrymusic/) - Minimalistic Web-Mediaplayer. ([Source Code](https://github.com/devsnd/cherrymusic)) `GPLv3` `Python`
-  * [cloudtunes](https://github.com/jkbrzt/cloudtunes) - Web-based music player for the cloud. `MIT` `Python/Javascript`
+  * [cloudtunes](https://github.com/jkbrzt/cloudtunes) `⚠` - Web-based music player for the cloud. `MIT` `Python/Javascript`
   * [GNU FM](https://gnu.io/fm/) - Running music community websites, alternative to last.fm. ([Source Code](http://git.savannah.gnu.org/cgit/librefm.git/)) `AGPLv3` `PHP`
   * [Groove Basin](http://groovebasin.com/) - A music player server with a web-based user interface inspired by Amarok 1.4 ([Source Code](https://github.com/andrewrk/groovebasin)) `MIT` `Nodejs`
   * [Icecast 2](http://www.icecast.org/) - streaming audio/video server which can be used to create an Internet radio station or a privately running jukebox and many things in between. ([Source Code](https://git.xiph.org/?p=icecast-server.git;a=summary)) `GPLv2` `C`