update demo link

Author: GavinJoyce

README.md

@@ -2,7 +2,7 @@
 
 A plugin that provides a helpful `?` dev time utility.
 
-**Demo**: https://play.tailwindcss.com/yH1AlcdPD7
+**Demo**: https://play.tailwindcss.com/5a9dYkfqd4
 
 ![example](https://user-images.githubusercontent.com/2526/100670452-ca598300-3356-11eb-8743-5d4d3c7b740f.gif)
 
@@ -37,4 +37,4 @@ module.exports = {
 
 Simply add the `?` utility class to any element that you'd like to highlight.
 
-**Demo**: https://play.tailwindcss.com/yH1AlcdPD7
+**Demo**: https://play.tailwindcss.com/5a9dYkfqd4