Update changelog

Author: Bogdan Gavrilovic

CommandLineTool.yml

@@ -70,8 +70,10 @@ $graph:
           except for files or directories specified using
           [InitialWorkDirRequirement](#InitialWorkDirRequirement).
         * Clarify semantics of `shellQuote`.
-        * Expressions are now allowed to evaluate to `null`, `File[]`, `Directory[]`
-          or `Dirent` in [InitialWorkDirRequirement.listing](#InitialWorkDirRequirement).
+        * Expressions are now allowed to evaluate to `null` or `Dirent` in
+          [InitialWorkDirRequirement.listing](#InitialWorkDirRequirement).
+        * Items in [InitialWorkDirRequirement.listing](#InitialWorkDirRequirement)
+          are now allowed to be `null` and `array<File | Directory>`.
         * Clarify behavior of secondaryFiles on output.
         * [Addition](#Requirements_and_hints) of `cwl:requirements` field to
           input object documents.