adapt multierror

Signed-off-by: Pierre Fenoll <pierrefenoll@gmail.com>

Author: fenollp

openapi3/errors.go

@@ -30,6 +30,14 @@ func (e ValidationError) Errors() []gojsonschema.ResultError {
 	return e
 }
 
+func (e ValidationError) asMultiError() MultiError {
+	errs := make([]error, 0, len(e))
+	for _, re := range e {
+		errs = append(errs, errors.New(re.String()))
+	}
+	return errs
+}
+
 // MultiError is a collection of errors, intended for when
 // multiple issues need to be reported upstream
 type MultiError []error