message: fix: type for string message template for extend()
diff: @@ -42,7 +42,7 @@ export type RuleParamSchema = string | RuleParamConfig;
  export interface ValidationRuleSchema {
  validate?: ValidationRuleFunction;
  params?: RuleParamSchema[];
  - message?: ValidationMessageGenerator;
  + message?: ValidationMessageTemplate;
  lazy?: boolean;
  computesRequired?: boolean;
  castValue?(value: any): any;
  