Update README.md

Author: gumbol

README.md

@@ -10,7 +10,7 @@ An HTML5 audio player that include functionalities like
 ## Note
 In order to get the same result as the Demo in your clone repo, you will need to download the [css files](https://github.com/gumbol/gumbol.github.io/tree/master/styles) of my website.
 
-[Demo](https://gumbol.github.io/posts/project-html5-audio-player.html)
+[Demo](https://gumbol.github.io/posts/app-project-html5-audio-player.html)