[ruby/io-wait] Fixed required_ruby_version
Before 3.0.0, io-wait has not been gemified.
https://github.com/ruby/io-wait/commit/6fed3da323
Added by nobu (Nobuyoshi Nakada) over 4 years ago
[ruby/io-wait] Fixed required_ruby_version
Before 3.0.0, io-wait has not been gemified.
https://github.com/ruby/io-wait/commit/6fed3da323