update REDEME

README.md

 # JPEG
 ## Here is the JPEG project maintained by MCCIPC.
 * Members in our group creat their own branches with the following naming format:
-  - xihuasheng/2020707_test1
+  - xihuasheng/20210707_test1
 * git clone https://git.ustc.edu.cn/mccipc/jpeg.git
 * cd jpeg
-* git branch xihuasheng/2020707_test1
-* git checkout xihuasheng/2020707_test1
+* git branch xihuasheng/20210707_test1
+* git checkout xihuasheng/20210707_test1
 * creat or delete or modify files
 * git add .
 * git commit -m 'xxxxx'
-* git push origin xihuasheng/2020707_test1:xihuasheng/2020707_test1
+* git push origin xihuasheng/2020707_test1:xihuasheng/20210707_test1
 * Please do not push to main
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