Fix contract_kind

slither/solc_parsing/declarations/contract.py

@@ -157,7 +157,7 @@ class ContractSolc(CallerContextExpression):
         if "contractKind" in attributes:
             if attributes["contractKind"] == "interface":
                 self._contract.is_interface = True
-            self._contract.kind = attributes["contractKind"]
+            self._contract.contract_kind = attributes["contractKind"]
         self._linearized_base_contracts = attributes["linearizedBaseContracts"]
         # self._contract.fullyImplemented = attributes["fullyImplemented"]