Author: Michael R. Crusoe <mrc@commonwl.org>
Subject: Relax rdflib dependency
--- a/setup.py
+++ b/setup.py
@@ -51,7 +51,7 @@ setup(name='cwltool',
           'setuptools',
           'requests >= 2.4.3',
           'ruamel.yaml >= 0.12.4, < 0.15',
-          'rdflib >= 4.2.2, < 4.3.0',
+          'rdflib',
           'shellescape >= 3.4.1, < 3.5',
           'schema-salad >= 2.6.20170927145003, < 3',
           'typing >= 3.5.3',
