Update CHANGELOG.md

CHANGELOG.md

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+## 2021.4.23 UTC  
+1.更新了图片，添加了日期生成的规则，不会再停留了  
+2.修复了上个更新中判断证件号的bug  
+## 2021.4.19 UTC  
+1.添加了身份证号末位“X”的情况  
+2.优化布局和代码  
+
+## 2021.4.18 UTC  
+
+1.修复了可能引起程序崩溃的问题，简单优化了图片。  
+2.API支持到Android 5.1

LICENSE

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+MIT License
+
+Copyright (c) 2021 小习维尼---好可爱啊
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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 # AntiZhaPian
 假的国家反诈中心  
+# [更新日志](https://github.com/XJP-GIT/AntiZhaPian/blob/main/CHANGELOG.md)
 
 # 安装
-下载app-release.apk安装即可。  
-
-**仅支持Android 7.1 以上的系统。**
+下载[app-release.apk](https://github.com/XJP-GIT/AntiZhaPian/raw/main/app-release.apk)(点击即可下载)，安装即可。    
+# 特性  
+点击```我的---点击查看个人信息 >```即可查看个人信息，点击```我的---头像```即可修改个人信息。    
+## 注意
+**1.其余按钮和内容均为贴图。**  
+**2.本App不需要任何权限。**  
+**3.支持到Android 5.1 以上的系统。**  
+**4.项目采用 MIT License**
 
 # 编译
-解压source.zip，Android Studio中打开即可。
+解压source.zip，在Android Studio中打开即可。