Add Label.created_by.

Author: florijanstamenkovic

labelbox/schema/label.py

@@ -23,6 +23,7 @@ def __init__(self, *args, **kwargs):
     project = Relationship.ToOne("Project")
     data_row = Relationship.ToOne("DataRow")
     reviews = Relationship.ToMany("Review", False)
+    created_by = Relationship.ToOne("User", False, "created_by")
 
     @staticmethod
     def bulk_delete(labels):

tests/integration/test_label.py

@@ -20,6 +20,7 @@ def test_labels(label_pack):
 
     assert label.project() == project
     assert label.data_row() == data_row
+    assert label.created_by() == label.client.get_user()
 
     label.delete()