Updated the readme to use the latest signal names from Qt 5.5 implementation of Qt Canvas3D.
Updated the readme to use the latest signal names from Qt 5.5 implementation of Qt Canvas3D.

TanNgocDo/three.js,TanNgocDo/three.js,TanNgocDo/three.js,tronlec/three.js,tronlec/three.js,TanNgocDo/three.js,tronlec/three.js,tronlec/three.js,TanNgocDo/three.js,tronlec/three.js,TanNgocDo/three.js,tronlec/three.js