added missed validated annotation.

Author: HugoMario

modules/swagger-codegen/src/main/resources/JavaSpring/api.mustache

@@ -52,6 +52,9 @@ import java.util.Optional;
 import java.util.concurrent.{{^jdk8}}Callable{{/jdk8}}{{#jdk8}}CompletableFuture{{/jdk8}};
 {{/async}}
 {{>generatedAnnotation}}
+{{#useBeanValidation}}
+@Validated
+{{/useBeanValidation}}
 @Api(value = "{{{baseName}}}", description = "the {{{baseName}}} API")
 {{#operations}}
 @RequestMapping(value = "{{{contextPath}}}")