Fix the action format

Fix the action format

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e1affcb..f45ca5a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -49,6 +49,6 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Release Gem
-        uses: CvX/publish-rubygems-action
+        uses: CvX/publish-rubygems-action@master
         env:
           RUBYGEMS_API_KEY: ${{secrets.RUBYGEMS_API_KEY}}

GitHub sha: d34fea34