Use gh rather than hub. Also fix release branch.

Author: oschwald

README.dev.md

@@ -5,7 +5,7 @@ Steps for releasing:
 2. Bump copyright year in `README.md`, if necessary.
 3. Review `CHANGELOG.md` for completeness and correctness. Update its release
    date.
-4. Install or update [hub](https://github.com/github/hub) as it used by the
+4. Install or update [gh](https://github.com/cli/cli) as it used by the
    release script.
 5. Run `./dev-bin/release.sh`. This will build the phar, generate the docs,
    tag the release, push it to origin, and update the GH releases with the

dev-bin/release.sh

@@ -142,6 +142,6 @@ message="$version
 
 $notes"
 
-hub release create -a "$phar" -m "$message" "$tag"
+gh release create --target "$(git branch --show-current)" -n "$message" "$tag" "$phar"
 
 git push --tags