Update README.md

Author: dmarcos

README.md

@@ -2,7 +2,7 @@
 
 <p align="center"><a href="https://aframe.io" target="_blank"><img width="480" alt="A-Frame" src="https://user-images.githubusercontent.com/674727/32120889-230ef110-bb0f-11e7-908c-76e39aa43149.jpg"></a></p>
 
-<p align="center"><b>A web framework for building virtual reality experiences.</b></p>
+<p align="center"><b>A web framework for building browser based 3D, AR and VR experiences.</b></p>
 
 <p align="center">
   <a href="https://codecov.io/gh/aframevr/aframe">