Support for blender 2.91

[psanche]

blender 2.91 version changed the raycast https://wiki.blender.org/wiki/Reference/Release_Notes/2.91/Python_API
If addon/utils/ray.py line 58 is changed from

hit, location, normal, index, object, matrix = context.scene.ray_cast(
    context.view_layer, origin, direction)

to

hit, location, normal, index, object, matrix = context.scene.ray_cast(
    context.view_layer.depsgraph, origin, direction)

It should work in versions >= 2.91
#9