Fix #271 - Readline completely deprecated in Ruby 3.3 #59

Job	Run time
test (ubuntu-latest, head)	12s
test (ubuntu-latest, 3.3)	10s
test (ubuntu-latest, 3.2)	14s
test (ubuntu-latest, 3.1)	12s
test (ubuntu-latest, 3.0)	12s
test (ubuntu-latest, jruby)	37s
test (ubuntu-latest, jruby-head)	42s
test (ubuntu-latest, truffleruby)	26s
test (ubuntu-latest, truffleruby-head)	37s
test (ubuntu-latest, truffleruby+graalvm)	1m 30s
test (windows-latest, head)	1m 24s
test (windows-latest, 3.3)	1m 57s
test (windows-latest, mingw)	1m 10s
test (windows-latest, mswin)	1m 27s
test (windows-latest, ucrt)	1m 4s
test (macos-latest, head)	16s
test (macos-latest, 3.3)	15s
	12m 25s

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