Update readme

Author: krlvm

README.md

@@ -19,7 +19,7 @@ It is a small C# WPF application that resembles a built-in Windows 10 taskbar fl
 Tray icon is hidden when there's no media is playing.
 
 ### Features
-* Double Click on tray icon to pause all media or play the last paused element
+* Middle Click or Double Click on tray icon to pause all media or play the last paused element
 * Right Click on tray icon to show flyout on top
 * Supports showing accent color on surface
 * Fluent Design support, including acrylic transparency