Bug in GeometryDescriptorBase.js

[alexhisen]

line 48:
PropTypes.arrayOf(PropTypes.arrayOf(PropTypes.arrayOf(THREE.Vector2))),
should instead be:
PropTypes.arrayOf(PropTypes.arrayOf(PropTypes.arrayOf(propTypeInstanceOf(THREE.Vector2)))),

Currently it's causing Vector2() to be called as a function which results in a "cannot set property 'x' of undefined" error

[toxicFork]

Thank you for the report :)