优化微博登录：

1.remind_in：该参数即将废弃，开发者请使用expires_in
2.uid作为openid，否则openid为空，理论上uid也是可以作为openid的

src/main/java/me/zhyd/oauth/consts/ApiUrl.java

@@ -472,7 +472,7 @@ public enum ApiUrl {
 
         @Override
         public String refresh() {
-            return "https://open.douyin.com/oauth/refresh_token";
+            return "https://open.douyin.com/oauth/refresh_token/";
         }
     },
     /**

src/main/java/me/zhyd/oauth/request/AuthWeiboRequest.java

@@ -39,7 +39,8 @@ public class AuthWeiboRequest extends BaseAuthRequest {
         return AuthToken.builder()
                 .accessToken(accessTokenObject.getString("access_token"))
                 .uid(accessTokenObject.getString("uid"))
-                .expireIn(accessTokenObject.getIntValue("remind_in"))
+                .openId(accessTokenObject.getString("uid"))
+                .expireIn(accessTokenObject.getIntValue("expires_in"))
                 .build();
     }