Add not about label to changelog

Author: Peter Amstutz

Workflow.yml

@@ -65,7 +65,7 @@ $graph:
           `WorkflowInputParameter.loadContents` instead.
         * The presence of `OutputRecordField.outputBinding` in v1.0 was due to
           a technical error and as it makes no semantic sense it was removed.
-
+        * `WorkflowStepInput` now has a `label` field
 
       See also the [CWL Command Line Tool Description, v1.1.0-dev1 changelog](CommandLineTool.html#Changelog).