cffr 1.4.1

• Internal code and documentation were reviewed and refactored with AI
  assistance to improve maintainability, consistency and user-facing messages.
• Tests were improved with AI assistance to reduce dependence on external
  services and make internal fixtures more robust.

What's Changed

• [codex] Refactor internals and align documentation by @dieghernan in #107
• Add coveralls to repo by @dieghernan in #108

Full Changelog: v1.4.0...v1.4.1