Update README.md

dukecat0 · web-flow · commit e8d23b5fdb47 · 2022-01-08T20:53:19.000+08:00
diff --git a/README.md b/README.md
@@ -81,5 +81,5 @@ $ volume --all 50
 If you want to adjust the volume from the command line faster, using `alias` would be a good choice:
 
 ```shell
-$ alias vol="volume"
+alias vol="volume"
 ```
