Fix readme's link to COMPARED_WITH_PRY doc #2744

Job	Run time
ruby-versions / Generate Ruby versions	2s
vterm-yamatanooroti 2.7 (latest reline)	1m 7s
rake test 2.7 (latest reline)	53s
vterm-yamatanooroti 2.7	1m 37s
rake test 2.7	52s
vterm-yamatanooroti 3.0 (latest reline)	49s
rake test 3.0 (latest reline)	1m 6s
vterm-yamatanooroti 3.0	52s
rake test 3.0	44s
vterm-yamatanooroti 3.1 (latest reline)	1m 22s
rake test 3.1 (latest reline)	41s
vterm-yamatanooroti 3.1	1m 18s
rake test 3.1	1m 5s
vterm-yamatanooroti 3.2 (latest reline)	1m 0s
rake test 3.2 (latest reline)	49s
vterm-yamatanooroti 3.2	47s
rake test 3.2	48s
vterm-yamatanooroti head (latest reline)	1m 1s
rake test head (latest reline)	52s
vterm-yamatanooroti head	45s
rake test head	1m 0s
rake test truffleruby-head (latest reline)	7m 22s
rake test truffleruby-head	4m 40s
	31m 32s

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