Update v6 README.md (#1384)

README.md

@@ -45,7 +45,7 @@ jobs:
       #    echo "GHE_HOST=${GITHUB_SERVER_URL##https:\/\/}" >> $GITHUB_ENV
 
       # Drafts your next Release notes as Pull Requests are merged into "master"
-      - uses: release-drafter/release-drafter@v5
+      - uses: release-drafter/release-drafter@v6
         # (Optional) specify config name to use, relative to .github/. Default: release-drafter.yml
         # with:
         #   config-name: my-config.yml