Requires schema-salad 4.2 for cwl v1.1 support. (#1123)

Author: Peter Amstutz

setup.py

@@ -57,7 +57,7 @@
           'ruamel.yaml >= 0.12.4, <= 0.15.77',
           'rdflib >= 4.2.2, < 4.3.0',
           'shellescape >= 3.4.1, < 3.5',
-          'schema-salad >= 4.1, < 5',
+          'schema-salad >= 4.2, < 5',
           'mypy-extensions',
           'six >= 1.9.0',  # >= 1.9.0 required by prov
           'psutil',