Update CHANGELOG.md

Update for 1.12.1

Prepare 1.12.0 Release.

Disable PRF by default.

Merge branch 'master' of github.com:janet-lang/janet into master

Prepare for 1.11.1 release.

Release 1.11.0

Update to 1.10.1

Conditionally install jpm in meson.

1.9.1 release.