Update Emby with correct (HTTPS) link and a better description.

The description for Emby was incredibly unhelpful, in my opinion. It
simply read that it was "built with popular open source technologies,"
which gives a reader no meaningful information about why it might be a
good option. A better description would call out a feature or offer a
reason distinct from other items in the same category. I think Emby's
out-of-the-box support for both DLNA and DIAL is worth noting and helps
the reader understand what and why Emby actually is more quickly.

README.md

@@ -803,7 +803,7 @@ See also <https://en.wikipedia.org/wiki/List_of_streaming_media_systems>, <https
 - [crtmpserver](https://packages.debian.org/stable/crtmpserver) - High performance RTMP/RTSP streaming server. `GPL-3.0` `C++`
 - [CyTube](https://github.com/calzoneman/sync) - CyTube is a web application providing media synchronization, chat, and more for an arbitrary number of channels. ([Demo](http://cytu.be)) `MIT` `Nodejs`
 - [Darwin Streaming Server](https://macosforge.github.io/dss/) - High performance server for streaming QuickTime and MPEG-4 media over RTP and RTSP protocols. Originated as Apple’s QTSS. ([Source Code](https://github.com/macosforge/dss)) `APSL-2.0` `C++`
-- [Emby](http://emby.media/) - A home media server built using other popular open source technologies. ([Source Code](https://github.com/MediaBrowser/Emby)) `GPL-2.0` `C#`
+- [Emby](https://emby.media/) - Home media server supporting both DLNA and DIAL (Chromecast) devices out-of-the-box. ([Source Code](https://github.com/MediaBrowser/Emby)) `GPL-2.0` `C#`
 - [Flumotion](http://flumotion.net/) - A streaming media server with intuitive graphical administration tools. ([Source Code](https://github.com/Flumotion/flumotion)) `LGPL-2.1` `Python`
 - [Hellowlol HTPC Manager fork](https://github.com/Hellowlol/HTPC-Manager) - A fully responsive interface to manage all your favorite media on your HTPC. ([Source Code](https://github.com/styxit/HTPC-Manager)) `MIT` `Python`
 - [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)) `GPL-2.0` `C`