Nh3

What's Changed
* Fix type for ALLOWED_ATTRIBUTES by seanbudd in https://github.com/messense/nh3/pull/35
* Improve documentation by lepture in https://github.com/messense/nh3/pull/39
* Bump ammonia from 3.3.0 to 4.0.0 by dependabot in https://github.com/messense/nh3/pull/40

New Contributors
* seanbudd made their first contribution in https://github.com/messense/nh3/pull/35
* lepture made their first contribution in https://github.com/messense/nh3/pull/39

**Full Changelog**: https://github.com/messense/nh3/compare/v0.2.15...v0.2.17

What's Changed
* Bump pyo3 from 0.19.2 to 0.20.0 by dependabot in https://github.com/messense/nh3/pull/27
* Improve README by adamchainz in https://github.com/messense/nh3/pull/30
* Improve documentation by adamchainz in https://github.com/messense/nh3/pull/31

New Contributors
* adamchainz made their first contribution in https://github.com/messense/nh3/pull/30

**Full Changelog**: https://github.com/messense/nh3/compare/v0.2.14...v0.2.15