update RELEASE.md

Author: pboos

RELEASE.md

@@ -1,7 +1,7 @@
 # Release process
 
 1. Update the `version` in `build.gradle`
-   - Push this to `main`
+   - Push this to `main` (optionally with a PR)
 2. Create a new release on github: [direct link](https://github.com/getyourguide/openapi-validation-java/releases/new)
    - Choose a tag `v....` (the new version)
    - Select "Create new tag"