add ruby 2.2, 2.3, and 2.4 to CI matrix

guard / listen

The Listen gem listens to file modifications and notifies you about the changes.

https://rubygems.org/gems/listen

MIT License

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Closed ColinDKelley closed 3 years ago

ColinDKelley commented 3 years ago

I'm giving up on ruby 2.2 and 2.3 based on CI results. Closing this PR in favor of https://github.com/guard/listen/pull/536.