Fix #271 - Readline completely deprecated in Ruby 3.3 #63

Job	Run time
test (ubuntu-latest, head)	11s
test (ubuntu-latest, 3.3)	15s
test (ubuntu-latest, 3.2)	12s
test (ubuntu-latest, 3.1)	11s
test (ubuntu-latest, 3.0)	11s
test (ubuntu-latest, jruby)	55s
test (ubuntu-latest, jruby-head)	43s
test (ubuntu-latest, truffleruby)	28s
test (ubuntu-latest, truffleruby-head)	37s
test (ubuntu-latest, truffleruby+graalvm)	1m 28s
test (windows-latest, head)	1m 10s
test (windows-latest, 3.3)	1m 24s
test (windows-latest, mingw)	1m 8s
test (windows-latest, mswin)	1m 12s
test (windows-latest, ucrt)	1m 10s
test (macos-latest, head)	20s
test (macos-latest, 3.3)	21s
	11m 56s

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