Update README.md (#9619)

"Dummies" is condescending toward the audience. Let's give them some credit. ; )

README.md

@@ -3,7 +3,7 @@ three.js
 
 #### JavaScript 3D library ####
 
-The aim of the project is to create a lightweight 3D library with a very low level of complexity — in other words, for dummies. The library provides <canvas>, <svg>, CSS3D and WebGL renderers.
+The aim of the project is to create a lightweight 3D library with a very low level of complexity - in other words, easy to use. The library provides <canvas>, <svg>, CSS3D and WebGL renderers.
 
 [Examples](http://threejs.org/examples/) — [Documentation](http://threejs.org/docs/) — [Migrating](https://github.com/mrdoob/three.js/wiki/Migration) — [Help](http://stackoverflow.com/questions/tagged/three.js)