Squashed 'cwltool/schemas/' changes from d13091a..4e24484

4e24484 Fix "out" to be valid Avro schema.

git-subtree-dir: cwltool/schemas
git-subtree-split: 4e24484

Author: Peter Amstutz

draft-4/Workflow.yml

@@ -294,9 +294,7 @@ $graph:
     - name: out
       type:
         - type: array
-          items: string
-        - type: array
-          items: "#WorkflowStepOutput"
+          items: [string, "#WorkflowStepOutput"]
       jsonldPredicate:
         _id: "cwl:out"
         _type: "@id"