remove jsonref

hoping python-jsonschema/jsonschema#447 is resolved

Author: dhimmel

manubot/cite/citeproc.py

@@ -16,13 +16,12 @@ def get_jsonschema_csl_validator():
     """
     Return a jsonschema validator for the CSL Item JSON Schema
     """
-    import jsonref
     import jsonschema
+    import requests
 
     # todo: revert to manubot branch after testing
     url = "https://github.com/dhimmel/csl-schema/raw/19596ab022f220de1239559400b31ee1ef9dc2ad/csl-data.json"
-    # Use jsonref to workaround https://github.com/Julian/jsonschema/issues/447
-    schema = jsonref.load_uri(url, jsonschema=True)
+    schema = requests.get(url).json()
     Validator = jsonschema.validators.validator_for(schema)
     Validator.check_schema(schema)
     return Validator(schema)

setup.py

@@ -67,7 +67,6 @@
         "errorhandler",
         "isbnlib",
         "jinja2",
-        "jsonref",
         "jsonschema",
         "packaging",
         "panflute",