Remove pin for MarkupSafe (#244)

Author: willkg

setup.py

@@ -15,10 +15,8 @@
     install_requires=[
         'Jinja2>2.0',
         'parsimonious>=0.10.0,<0.11.0',
-        'Sphinx>=4.1.0',
-        # Pin markupsafe because of
-        # https://github.com/pallets/jinja/issues/1585
-        'markupsafe==2.0.1',
+        'Sphinx>=5.0.0',
+        'markupsafe',
     ],
     python_requires='>=3.9',
     classifiers=[