No reason to include the draft-N schemas

They haven't been used for years

Author: mr-c

MANIFEST.in

@@ -62,9 +62,6 @@ prune cwltool/schemas/v1.0/salad/schema_salad/tests
 prune cwltool/schemas/v1.1.0-dev1/salad/typeshed
 prune cwltool/schemas/v1.1.0-dev1/salad/schema_salad/tests
 prune cwltool/schemas/presentations
-prune cwltool/schemas/draft-2
-prune cwltool/schemas/draft-1
-prune cwltool/schemas/draft-3
 prune cwltool/schemas/site
 prune cwltool/schemas/v1.0/examples
 prune cwltool/schemas/v1.0/v1.0

cwltool/load_tool.py

@@ -307,8 +307,10 @@ def resolve_and_validate_document(
             "No cwlVersion found. "
             "Use the following syntax in your CWL document to declare "
             "the version: cwlVersion: <version>.\n"
-            "Note: if this is a CWL draft-2 (pre v1.0) document then it "
-            "will need to be upgraded first."
+            "Note: if this is a CWL draft-3 (pre v1.0) document then it "
+            "will need to be upgraded first using https://pypi.org/project/cwl-upgrader/ . "
+            "'sbg:draft-2' documents can be upgraded using "
+            "https://pypi.org/project/sevenbridges-cwl-draft2-upgrader/ ."
         )
 
     if not isinstance(cwlVersion, str):