Prepare v0.6.0 (#1434)

* version bump

* add generated changelog

* changelog script: fix type of additional PRs

* update autogenerated changelog

* add releases category

* a bit more copyediting

* rewrite author logic

* regenerate changelog

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* regenerate changelog

* merge logic for authors/reviewers and label sorting (fewer GH requests!)

* regenerate changelog

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* fix some formatting and add more references

Co-authored-by: Jason Villanueva <[email protected]>

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Jason Villanueva <[email protected]>