Release version with io/wait require fix

[headius]

I put the io/wait require behind a Ruby 3.2 guard in #75. I would like a release that includes that patch so I can update JRuby. Nobody is listed as owner for this so I ping recent contributors: @hsbt @olleolleolle

[hsbt]

I will do that today.

[hsbt]

0.4.0 is out with the io/wait guard from #75.