doc: update README

Author: tsvetomir

README.md

@@ -43,6 +43,8 @@ This project has been tested in Travis-CI and Jenkins builds.
 
 4. Use `semantic-prerelease publish` instead of `npm publish` in the end of your build. This publishes the prerelease versions behind dist-tags.
 
+5. (Optionally) Publish scoped packages as public by using `semantic-prerelease publish --public`
+
 With the above setup, new official releases (bearing the `latest` dist-tag) can be published from `master` by fast-forwarding it to `develop`:
 
     git checkout master && git merge --ff-only develop && git push