Wrong pointer for relationships

[sergiufreemind]

In file ValidationErrorDocument pointer is hardcoded to display attributes:
$pointer = '/data/attributes/'.$fieldError->getPropertyPath();

if i have validation error in my relationship then i will still receive in errors pointer to attributes, not to relationships.

actual result :
{ "jsonapi": { "version": "1.0" }, "errors": [ { "detail": "This value should not be blank.", "source": { "pointer": "/data/attributes/branch", "parameter": "Invalid Value" } } ] }

expected:

{ "jsonapi": { "version": "1.0" }, "errors": [ { "detail": "This value should not be blank.", "source": { "pointer": "/data/relationships/branch", "parameter": "Invalid Value" } } ] }