Add JSFiddle example

Author: developit

README.md

@@ -10,6 +10,9 @@
 > `1kb` and works in Node and browsers.
 
 
+[**JSFiddle Demo:**](https://jsfiddle.net/developit/4qv3v6r3/) Rendering [preact](https://github.com/developit/preact/) components into an undom Document.
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