chore: release 0.38.0

[github-actions[bot]]

:robot: I have created a release *beep* *boop*

0.38.0 (2021-12-25)

Features

• Add aux field to tooltip (#226) (cfc8fe5)

Bug Fixes

• Apply latest clippy lints (#227) (d1a60cc)

This PR was generated with Release Please. See documentation.

[github-actions[bot]]

:robot: Release is at https://github.com/rust-bio/rust-bio-tools/releases/tag/v0.38.0 :sunflower: