doc：完善文档

Author: liranhao

.github/workflows/publish.yml

@@ -2,20 +2,22 @@ name: Publish to Pub.dev
 
 on: 
   pull_request:
+    types:
+      - closed
     branches: 
       - master
-
 jobs:
   publishing:
+    if: github.event.pull_request.merged == true
     runs-on: ubuntu-latest
     steps:
       - name: 'Checkout'
         uses: actions/checkout@main # required!
-        
       - name: '>> Dart package <<'
         uses: k-paxian/dart-package-publisher@master
         with:
           accessToken: ${{secrets.OAUTH_ACCESS_TOKEN }}
           refreshToken: ${{secrets.OAUTH_REFRESH_TOKEN }}
           skipTests: true
-          force: true
+          force: true
+