Merge pull request http4s#4115 from http4s/1.0.0-M10

Release v1.0.0-M10

Merge pull request http4s#4114 from http4s/0.21.15

Release v0.21.15

More v1.0.0-M9 notes

Release v0.21.14, take 3

Merge pull request http4s#3919 from http4s/1.0.0-M8

Release notes for 1.0.0-M8

Merge pull request http4s#3932 from http4s/0.21.13

Downgrade to munit-cats-effect-0.8.0, curse 0.9.0

Merge pull request http4s#3917 from http4s/0.21.12

Changelog for v0.21.12

Release v1.0.0-M7

Release v0.21.11

Release v1.0.0-M6