Dropping Ruby 2.6 support?

[tnir]

#39 just dropped Ruby 2.6 support, but was it intentional? Ruby 2.6 will be officially supported until 2022-04-30. https://www.ruby-lang.org/en/downloads/

[tnir]

@indrekj Thoughts?

[indrekj]

If it's not a huge effort then I would actually like to keep supporting 2.6 until EOL. It kind of passed me during the PR review. If you're willing to submit a PR then I'll make sure it gets reviewed and merged.