Update README's description of how to release new versions

README.md

@@ -86,7 +86,9 @@ The full set of commands available to the `litestream` executable are covered in
 
 After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake test` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.
 
-To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and the created tag, and push the `.gem` file to [rubygems.org](https://rubygems.org).
+To install this gem onto your local machine, run `bundle exec rake install`.
+
+For maintainers, to release a new version, run `bin/release $VERSION`, which will create a git tag for the version, push git commits and tags, and push all of the platform-specific `.gem` files to [rubygems.org](https://rubygems.org).
 
 ## Contributing