Update README.md

README.md

 <p align="center"><a href="https://dataease.io"><img src="https://dataease.oss-cn-hangzhou.aliyuncs.com/img/dataease-logo.png" alt="DataEase" width="300" /></a></p>
 <h3 align="center">人人可用的开源数据可视化分析工具</h3>
 <p align="center">
-  <a href="https://www.gnu.org/licenses/old-licenses/gpl-2.0"><img src="https://img.shields.io/github/license/dataease/dataease?color=%231890FF&style=flat-square" alt="License: GPL v2"></a>
+  <a href="https://www.gnu.org/licenses/old-licenses/gpl-3.0"><img src="https://img.shields.io/github/license/dataease/dataease?color=%231890FF" alt="License: GPL v3"></a>
   <a href="https://app.codacy.com/gh/dataease/dataease?utm_source=github.com&utm_medium=referral&utm_content=dataease/dataease&utm_campaign=Badge_Grade_Dashboard"><img src="https://app.codacy.com/project/badge/Grade/da67574fd82b473992781d1386b937ef" alt="Codacy"></a>
   <a href="https://github.com/dataease/dataease/releases/latest"><img src="https://img.shields.io/github/v/release/dataease/dataease" alt="Latest release"></a>
   <a href="https://github.com/dataease/dataease"><img src="https://img.shields.io/github/stars/dataease/dataease?color=%231890FF&style=flat-square" alt="Stars"></a>
@@ -85,8 +85,8 @@ curl -sSL https://github.com/dataease/dataease/releases/latest/download/quick_st
 
 Copyright (c) 2014-2021 飞致云 FIT2CLOUD, All rights reserved.
 
-Licensed under The GNU General Public License version 2 (GPLv2)  (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
+Licensed under The GNU General Public License version 3 (GPLv3)  (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
 
-<https://www.gnu.org/licenses/gpl-2.0.html>
+<https://www.gnu.org/licenses/gpl-3.0.html>
 
 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.