v1.4.0 - Thanks to all the contributors

v1.4.0 (2024-05-30)

Full Changelog

• Add Ruby 3.3.0 to CI build matrix (#906) Masato Nakamura
• Fix rubocop CI (#910) (Masato Nakamura)
• Add metadata for rubygems.org and use https URLs (#909) (Masato Nakamura)
• Bump GHA actions/checkout to be on node20 by default (#911) (Masato Nakamura)
• Convert readme to markdown (#920) (Panos Dalitsouris)
• Fix typos, Found via codespell (#921) (Kian-Meng Ang)
• Bump ruby versions on test jobs (#927) (Masato Nakamura)
• Support for Ruby 3.4.0-preview1 (#929) (Masato Nakamura)
• Add "blank allowed" message to api doc (#926) (Peko)
• Custom headers responses (#924) (Panos Dalitsouris)