Update postgresql client to 17

Update build to newer FreeBSD

Adding release checksum.

Signing v0.4.0

Added tag v0.4.0 for changeset 635a2884e441

Bump the minor version, update history and gemspec.

Update for latest configurability, Ruby 3.4 compatibility

Update my gem-signing cert

Updating my gem-signing cert

Add references to the README

Add missing package to the CI build plan

Adding release checksum.

Signing v0.3.0

Added tag v0.3.0 for changeset 529f1d411a95

Bump the minor version, update history

Adding cztop instrumentation

Update for Ruby 2.7.

Guard against blockless observe calls

Add a provisional fix for arity-0 methods

Remove leftover hoe instructions from README