编辑用户名，改为当前月允许修改5次

src/main/java/com/ai/da/controller/AccountController.java

@@ -224,7 +224,7 @@ public class AccountController {
 
     @ApiOperation(value = "getUsernameModifyTimes")
     @GetMapping("/getNicknameModifyTimes")
-    public Response<Map<String, Long>> getNicknameModifyTimes(){
+    public Response<Long> getNicknameModifyTimes(){
         return Response.success(accountService.getNicknameModifyTimes());
     }