Changesets 3.0.0-next.11 release notes

#2190 96b65ee Thanks @bluwy! - Move versioned prerelease changesets to .changeset/pre/ folder instead of accumulating in the root and tracking the versioned changeset ids in the .changeset/pre.json file. Existing pre.json will auto-migrate to this new structure on the next run of changeset version or when calling changeset status.

This change allows easier management of versioned prerelease changesets (for the final stable release) and current queued changesets (for the next prerelease). Changesets in .changeset/pre/ can be edited or deleted depending if it's still relevant for the final stable release of a package. There's no need to synchronize the changeset ids in pre.json if certain changesets are deleted.
#2186 3910adf Thanks @Andarist! - Private packages are no longer versioned by default. Set privatePackages to true to opt into versioning and tagging them, or set privatePackages.version to true to version them without tagging.

#2135 fd7724a Thanks @youdie006! - Allow comma-separated values in array-valued CLI flags: the --major, --minor, and --patch flags of the add command, and the --ignore flag of the version command. For example, --minor pkg-a,pkg-b is now equivalent to --minor pkg-a --minor pkg-b. Surrounding whitespace is trimmed and empty entries are ignored.

Changesets 3.0.0-next.11