Squashed 'cwltool/schemas/' changes from 50fed92..4007cb0

4007cb0 Fix specialize on Workflow.
REVERT: 50fed92 Fix specialize on Workflow.

git-subtree-dir: cwltool/schemas
git-subtree-split: 4007cb0

Author: Peter Amstutz

draft-3/Workflow.yml

@@ -378,8 +378,8 @@ $graph:
   extends: "#Process"
   documentRoot: true
   specialize:
-    specializeFrom: "#OutputParameter"
-    specializeTo: "#WorkflowOutputParameter"
+    - specializeFrom: "#OutputParameter"
+      specializeTo: "#WorkflowOutputParameter"
   doc: |
     A workflow describes a set of **steps** and the **dependencies** between
     those processes.  When a process produces output that will be consumed by a