Easter egg for autocomplete mode #2665

Job	Run time
ruby-versions / Generate Ruby versions	3s
vterm-yamatanooroti 2.7 (latest reline)	1m 48s
rake test 2.7 (latest reline)	1m 13s
vterm-yamatanooroti 2.7	1m 34s
rake test 2.7	59s
vterm-yamatanooroti 3.0 (latest reline)	49s
rake test 3.0 (latest reline)	48s
vterm-yamatanooroti 3.0	47s
rake test 3.0	56s
vterm-yamatanooroti 3.1 (latest reline)	57s
rake test 3.1 (latest reline)	47s
vterm-yamatanooroti 3.1	52s
rake test 3.1	59s
vterm-yamatanooroti 3.2 (latest reline)	52s
rake test 3.2 (latest reline)	43s
vterm-yamatanooroti 3.2	46s
rake test 3.2	57s
vterm-yamatanooroti head (latest reline)	1m 1s
rake test head (latest reline)	1m 1s
vterm-yamatanooroti head	46s
rake test head	49s
rake test truffleruby-head (latest reline)	6m 54s
rake test truffleruby-head	6m 47s
	33m 8s

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