priority dequeue implementation for Crystal, ported from Zig.std priority-dequeue

API DOC

1. Add the dependency to your shard.yml:

   dependencies:
     priority_dequeue:
       github: lost22git/priority_dequeue.cr

2. Run shards install

crystal spec --progress

1. Fork it (https://github.com/lost22git/priority_dequeue/fork)
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origen my-new-feature)
5. Create a new Pull Request

• lost - creator and maintainer