Recognize .jsonld extension

IANA lists `application/ld+json` as a media type, including the
`.jsonld` file extension, here:
https://www.iana.org/assignments/media-types/application/ld+json
via https://www.iana.org/assignments/media-types/media-types.xhtml
via https://w3c.github.io/json-ld-syntax/#iana-considerations

Signed-off-by: Alex Nelson <alexander.nelson@nist.gov>

Author: ajnelson-nist

case_utils/__init__.py

@@ -37,6 +37,8 @@ def guess_format(fpath, fmap=None):
         updated_fmap = {key:rdflib.util.SUFFIX_FORMAT_MAP[key] for key in rdflib.util.SUFFIX_FORMAT_MAP}
         if not "json" in updated_fmap:
             updated_fmap["json"] = "json-ld"
+        if not "jsonld" in updated_fmap:
+            updated_fmap["jsonld"] = "json-ld"
     else:
         updated_fmap = {k:fmap[k] for k in fmap}