License metadata upload fix. (#100)

Fixes license metadata upload issue.

pyDataverse's Dataverse metadata schema
(pyDataverse/schemas/json/dataset_upload_default_schema.json in their
Github repository) seems to accept license as a string (as Dataverse's
Native API seems to have previously done in version 4) rather than an
object with "name" and "uri" values.

Made slight change to Dataverse upload job to note this and work around
it.

uploader/Dataverse/jobs.py

@@ -109,7 +109,12 @@ def run(self):
                     ],
                 }
             )
-            json.dump(dv_json, dv_json_file)
+
+            # Make slight metadata change to accord with pyDataverse client
+            dv_json["datasetVersion"]["license"] = dv_json["datasetVersion"]["license"][
+                "name"
+            ]
+
             ds.from_json(json.dumps(dv_json), validate=False)
 
         # Get the division acronym from the metadata in the AIP