Add Ruby 4.0.4 support and verify latest-Ruby compatibility#15
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Bump the development Ruby to 4.0.4, add 4.0 to the CI smoke-test matrix (and the lint job), and update the README badge and compatibility notes to document the 2.6-through-4.0 supported range. The smoke test and the git_report executable both run cleanly on Ruby 4.0.4, while the 2.6 floor is preserved.
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Summary
Adds and verifies compatibility with the latest Ruby (4.0.4), and documents the supported range accordingly.
.ruby-version3.4.9→4.0.4(local development Ruby only — does not narrow support)4.0to the CI smoke-test matrix (['2.6', '3.4', '4.0']) and bump the RuboCop lint job to4.02.6 – 4.0+and refresh the Features / Compatibility / Troubleshooting / project-structure / test-section textNo source changes were needed — the standard-library-only design (including the in-tree
lib/git/parallel.rb) already runs on 4.0.4.Verification
ruby test/smoke_test.rbon Ruby 4.0.4 — 2 runs, 12 assertions, 0 failuresbin/git_reportproduces the correct contributor table on Ruby 4.0.4 end-to-endbin/git_reportstill runs on the stock macOS system Ruby (2.6.10)