Pick

**Full Changelog**: https://github.com/wong2/pick/compare/v1.6.0...v2.0.0

Breaking Changes

* Drop `register_custom_handler`
* Drop `options_map_func`, replaced by `Option` class

What's Changed
* Update multiselect mode style
* Bump mypy from 0.961 to 0.971 by dependabot in https://github.com/wong2/pick/pull/74
* Bump pytest from 6.2.5 to 7.1.2 by dependabot in https://github.com/wong2/pick/pull/73

New Contributors
* dependabot made their first contribution in https://github.com/wong2/pick/pull/74

**Full Changelog**: https://github.com/wong2/pick/compare/v1.5.0...v1.6.0