Fix broken CI by #254 (#259)

Fixed typo: missing `v` for tag as version

Author: Rotzbua

.github/workflows/main.yml

@@ -19,7 +19,7 @@ jobs:
       - run: gem install bundler jekyll --no-document
       - run: bundle install
       - run: bundle exec jekyll build
-      - uses: JamesIves/github-pages-deploy-action@4
+      - uses: JamesIves/github-pages-deploy-action@v4
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           branch: gh-pages