refactor: 去除返回提示信息感叹号

app/admin/controller/v1/Captcha.php

@@ -24,7 +24,7 @@ class Captcha
         Cache::store('redis')->set('captcha:token.' . $token, $hash, Config::get('captcha.expire'));
 
         // 输出验证码
-        return success('获取验证码成功！', [
+        return success('获取验证码成功', [
             'token'   => $token,
             'captcha' => $captcha["img"],
         ]);