applicake/doorkeeper

### Summary

Provide a general description of the code changes in your pull
request... were there any bugs you had fixed? If so, mention them. If
these bugs have open GitHub issues, be sure to tag them here as well,
to keep the conversation linked together.

### Other Information

If there's anything else that's important and relevant to your pull
request, mention that information here. This could include
benchmarks, or other information.

If you are updating CHANGELOG.md file or are asked to update it by reviewers,
please add the changelog entry at the top of the file.

Thanks for contributing to Doorkeeper project!