Update README.md

Author: jeromewu

README.md

@@ -30,7 +30,7 @@ Use FFmpeg directly in your browser without any backend services!!
 
 ## Examples:
 
-| Name | CodePen | Source Code |
+| Name | Demo | Source Code |
 | ---- | ------- | ----------- |
 | Webcam | <a href="https://codepen.io/jeromewu/pen/qBBKzyW" target="_blank"><img alt="codepen" width="128px" src="https://blog.codepen.io/wp-content/uploads/2012/06/codepen-wordmark-display-inside-black@10x.png"></a> | [Link](https://github.com/ffmpegjs/ffmpeg.js/blob/master/examples/browser/webcam.html) |