Release 2.9.1

fix: enhance getLastCommit function to accurately identify the last commit that modified the package.json version - #19

test: update getLastCommit tests and fix expected version in lightRelease tests

fix: update devDependencies to replace chai with expect.js in package.json

fix: add devDependencies section for chai in package.json

fix: improve getLastCommit function to accurately retrieve the last commit affecting package.json version

fix: enhance getLastCommit function to retrieve commit hash based on version changes in package.json - #19

Merge pull request #18 from VincenzoManto/feature/2025-03-30Feature/2025 03 30

docs: add instructions for setting OpenAI API key as an environment variable in README

Merge pull request #16 from VincenzoManto/feature/2025-02-28Feature/2025 02 28