Added tag v0.22.0 for changeset 66dc3cb02fc4
Bump the minor version, update history and gemspec.
Make Sixfish the default RDoc generator
Fix diffing for the history file under Git
Adding release checksum.
Added tag v0.21.0 for changeset ce3ec0e563c1
Bump the minor version, update history.
Allow declaration of alternative RDoc generator
Only include plain files in the manifest
Adding release checksum.
Added tag v0.20.0 for changeset e308d450ce45
Bump the minor version, update history
Fix missing default and allow default manifest to be modified
Bump default Ruby version to 3.1
Update gem-signing cert
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