**Describe the bug** When converting to an open3d instance, the color of the point cloud is lost **To Reproduce** Steps to reproduce the behavior: ```python import open3d from pyntcloud import PyntCloud pointcloud = open3d.io.read_point_cloud("MyColorPointCloud.ply") open3d.visualization.draw_geometries([pointcloud]) # See screenshot below pyntcloud = PyntCloud.from_instance("open3d", pointcloud) pointcloud_reconverted = pyntcloud.to_instance("open3d") open3d.visualization.draw_geometries([pointcloud_reconverted]) # see screenshot below ``` **Expected behavior** The color should be preserved through `to_instance` call. **Screenshots** First visualization:  Second visualization:  **Desktop (please complete the following information):** - OS: Windows 10 - PyntCloud Version: 0.3.1