Update viewpoint

put https://api.bimtrackapp.co/v3/hubs/{hubId}/projects/{projectId}/issues/{issueId}/viewpoints/{viewpointId}

This method allows you to update a viewpoint with it's image if provided. If an image is provided
the first part of the body should be an application/json and the second on the image (jpeg,png,gif).
* ViewType is the minimum required info in order to create viewpoint. Possible values: "None", "TwoD" and "ThreeD".
Get JSON metadata file format : here.