docs: update README.md

Signed-off-by: shenxianpeng <xianpeng.shen@gmail.com>

Author: shenxianpeng

.github/workflows/commit-check.yml

@@ -17,4 +17,5 @@ jobs:
           branch: true
           author-name: true
           author-email: true
+          commit-signoff: true
           job-summary: true