Ignore type on undemonstrated class-member

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

Author: ajnelson-nist

case_mapping/uco/core.py

@@ -17,7 +17,7 @@ def __init__(
         The main CASE Object for representing a case and its activities and objects.
         """
         super().__init__(*args, **kwargs)
-        self.build = []
+        self.build = []  # type: ignore
         self["@context"] = {
             "@vocab": "http://caseontology.org/core#",
             "case-investigation": "https://ontology.caseontology.org/case/investigation/",