Adapt to frictionless API changes

validata_core/custom_checks/missing_required_header.py

@@ -27,7 +27,7 @@ class MissingRequiredHeader(Check):
         super().__init__(descriptor)
         self.__required_field_names = self.get("required_field_names")
 
-    def validate_header(self):
+    def validate_start(self):
         for pos, field_name in enumerate(self.__required_field_names):
             if field_name not in self.resource.header:
                 yield MissingRequiredHeaderError(