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I've added some support for ruby 3.0 in travis configuration. The quotes are just here in case you choose to move to GitHub actions, I can get rid of it if need be.
More on Travis VS GitHub actions. Support for open source from travis has gone missing (https://news.ycombinator.com/item?id=25155203), I can make a next PR moving from travis to github actions if you want 🙂. Done that for most of my repos now, it is easy and support matrix as well (and support windows if you ever want to add tests for it)
If I am to make that PR, may I remove tests for unsupported ruby versions (1.8 up to 2.4, https://www.ruby-lang.org/en/news/2020/04/05/support-of-ruby-2-4-has-ended/)?
Thanks for the great gem!