update readme

README.md

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  <p align="center"><img width="800" src="https://github.com/sentriz/gonic/blob/master/.github/gonic.png?raw=true"></p>
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+ ## features
+
+ -- browsing by folder (keeping your full tree intact)  
+ -- browsing by tags (using [taglib](https://taglib.org/) - supports mp3, opus, flac, ape, m4a, wav, etc.)  
+ -- pretty fast scanning (with my library of ~27k tracks, first scan takes about 10m, and about 5s after that)  
+ -- last.fm scrobbling  
+ -- multiple users  
+ -- a web interface (set up last.fm, manage users, start scans, etc.)  
+ -- newer salt and token auth  
+ -- tested on [dsub](https://f-droid.org/en/packages/github.daneren2005.dsub/) and [jamstash](http://jamstash.com/)