Update README.md

Author: Zeunig

README.md

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 A simple-to-use command line tool for mass downloading tracks, playlists and albums, made with only 4 dependencies (id3,mp3cat,regex,reqwest)
 
 ## Usage
-scdownload <track/album/playlist> <id> 
+scdownload <track/album/playlist/artist> <id> 
 ### Example
 scdownload playlist zeunig/sets/hardstyle
+scdownload artist zeunig
+scdownload track zeunig/garou-hardstyle
 ### Additional arguments
 --temp-dir="path" : Changes the cache dir<br />
 --download-dir="path" : Changes the download dir