Fix whitespace in deps file

Update to the latest Sixfish

Fix docs URL

Adding release checksum.

Updating my gem-signing cert

Signing v1.4.0

Added tag v1.4.0 for changeset bda57328052a

Bump the minor version, update history.

Fix up error class in codetag.

Updated docs to use Markdown, fixed up some 3.1 issues

Remove unfinished diagrams

Convert CLI to GLI+TTY

Remove frozen-string pragma

Make 3.1 the default Ruby

Update gem-signing cert

Update for Ruby 3, modernize RSpec setup

Also updated my gem-signing cert.

Adding release checksum.

Updating my gem-signing cert

Signing v1.3.1

Added tag v1.3.1 for changeset 608ba9b16ed5