What's Changed Update versions in requirements.txt by @aaronspring in https://github.com/pangeo-data/climpred/pull/673 add valid_time as initialized coord by @aaronspring in https://github.com/pangeo-data/climpred/pull/675 Bump actions/github-script from 4.1 to 5 by @dependabot in https://github.com/pangeo-data/climpred/pull/676 add tests to show #586 can be closed by @aaronspring in https://github.com/pangeo-data/climpred/pull/677 Fixes after #675 by @aaronspring in https://github.com/pangeo-data/climpred/pull/678 Update print_versions.py by @aaronspring in https://github.com/pangeo-data/climpred/pull/681 Update bias_removal.py by @aaronspring in https://github.com/pangeo-data/climpred/pull/682 setup_requires into pyproject.toml by @aaronspring in https://github.com/pangeo-data/climpred/pull/684 optional dependencies by @aaronspring in https://github.com/pangeo-data/climpred/pull/686 implement LESS by @aaronspring in https://github.com/pangeo-data/climpred/pull/687 Verify_groupby by @aaronspring in https://github.com/pangeo-data/climpred/pull/690 Remove seasonality by @aaronspring in https://github.com/pangeo-data/climpred/pull/688 typing annotations by @aaronspring in https://github.com/pangeo-data/climpred/pull/692 Refactor add_attrs into classes verify() by @aaronspring in https://github.com/pangeo-data/climpred/pull/694 add attrs to new coords by @aaronspring in https://github.com/pangeo-data/climpred/pull/697 fix valid_time freq bug by @aaronspring in https://github.com/pangeo-data/climpred/pull/700 add HindcastEnsemble.plot_alignment() by @aaronspring in https://github.com/pangeo-data/climpred/pull/702 reduce skipped tests by @aaronspring in https://github.com/pangeo-data/climpred/pull/704 Fix climatology season and weekofyear by @aaronspring in https://github.com/pangeo-data/climpred/pull/703 ♻️ resample uninitialized from initialized in HindcastEnsemble by @aaronspring in https://github.com/pangeo-data/climpred/pull/691 🧷persistence with initialized lead=0 by @aaronspring in https://github.com/pangeo-data/climpred/pull/706 improve docs by @aaronspring in https://github.com/pangeo-data/climpred/pull/708 📚 revise docs incl. notebooks by @aaronspring in https://github.com/pangeo-data/climpred/pull/709 use sphinxcontrib-bibtex by @aaronspring in https://github.com/pangeo-data/climpred/pull/710 release v2.2.0 by @aaronspring in https://github.com/pangeo-data/climpred/pull/711 Full Changelog: https://github.com/pangeo-data/climpred/compare/v2.1.6...v2.2.0

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