Fix

.github/workflows/publish.yaml

@@ -0,0 +1,21 @@
+name: Publish Dart Package
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup Dart SDK
+        uses: dart-lang/setup-dart@v2
+        with:
+          sdk: stable
+      - name: Publish Package
+        env:
+          PUB_PUBLISH_ACCESS_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          dart pub publish --dry-run
+          dart pub publish -f