chore: remove build badges

[suztomo]

Removes old badge references.

b/468377909

[gemini-code-assist]

Summary of Changes

Hello @suztomo, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on tidying up the repository's documentation by eliminating references to old build badges. The change ensures that the README.md accurately reflects the current status and avoids displaying potentially irrelevant or broken links, contributing to a cleaner and more maintainable project overview.

Highlights

• Documentation Cleanup: Removed outdated build status badges for Ruby 2.4 and Ruby 2.5 from the README.md file.

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[gemini-code-assist]

Code Review

This pull request removes outdated build status badges for Ruby 2.4 and 2.5 from the README.md file. The change is straightforward and helps to clean up the documentation by removing irrelevant information. The changes are correct and I have no further suggestions.