remove_method of Module is private at Ruby 2.3 and 2.4 #159

Job	Run time
ruby-versions / Generate Ruby versions	3s
ubuntu-20.04 2.3	1m 31s
ubuntu-20.04 2.4	1m 28s
ubuntu-20.04 2.5	1m 16s
ubuntu-20.04 2.6	1m 48s
ubuntu-20.04 2.7	1m 17s
ubuntu-20.04 3.0	35s
ubuntu-20.04 3.1	43s
ubuntu-20.04 3.2	34s
ubuntu-20.04 head	34s
ubuntu-20.04 jruby	1m 29s
ubuntu-20.04 jruby-head	2m 4s
ubuntu-20.04 truffleruby	54s
ubuntu-20.04 truffleruby-head	1m 9s
ubuntu-22.04 2.3	1m 40s
ubuntu-22.04 2.4	1m 33s
ubuntu-22.04 2.5	1m 29s
ubuntu-22.04 2.6	1m 45s
ubuntu-22.04 2.7	1m 17s
ubuntu-22.04 3.0	25s
ubuntu-22.04 3.1	28s
ubuntu-22.04 3.2	22s
ubuntu-22.04 head	33s
ubuntu-22.04 jruby	1m 45s
ubuntu-22.04 jruby-head	1m 56s
ubuntu-22.04 truffleruby	1m 5s
ubuntu-22.04 truffleruby-head	1m 12s
macos-11 2.3	2m 16s
macos-11 2.4	2m 0s
macos-11 2.5	1m 58s
macos-11 2.6	2m 3s
macos-11 2.7	2m 7s
macos-11 3.0	33s
macos-11 3.1	36s
macos-11 3.2	39s
macos-11 head	33s
macos-11 jruby	1m 25s
macos-11 jruby-head	1m 21s
macos-11 truffleruby	1m 19s
macos-11 truffleruby-head	1m 36s
macos-12 2.3	2m 5s
macos-12 2.4	2m 29s
macos-12 2.5	2m 8s
macos-12 2.6	2m 17s
macos-12 2.7	3m 58s
macos-12 3.0	2m 10s
macos-12 3.1	39s
macos-12 3.2	1m 55s
macos-12 head	31s
macos-12 jruby	2m 59s
macos-12 jruby-head	2m 5s
macos-12 truffleruby	1m 26s
macos-12 truffleruby-head	2m 9s
windows-latest 2.3	2m 24s
windows-latest 2.4	3m 37s
windows-latest 2.5	4m 45s
windows-latest 2.6	4m 33s
windows-latest 2.7	3m 38s
windows-latest 3.0	1m 45s
windows-latest 3.1	2m 6s
windows-latest 3.2	4m 1s
windows-latest head	1m 39s
ubuntu-latest jruby-9.1	1m 39s
ubuntu-latest jruby-9.2	1m 42s
ubuntu-latest jruby-9.3	1m 36s
	1h 49m 37s

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