Prepare 1.7.2 #386

Job	Run time
ruby-versions / Generate Ruby versions	2s
test (2.5, ubuntu-latest)	40s
test (2.5, macos-latest)	1m 22s
test (2.5, windows-latest)	2m 59s
test (2.6, ubuntu-latest)	38s
test (2.6, macos-latest)	57s
test (2.6, windows-latest)	3m 21s
test (2.7, ubuntu-latest)	34s
test (2.7, macos-latest)	51s
test (2.7, windows-latest)	2m 51s
test (3.0, ubuntu-latest)	21s
test (3.0, macos-latest)	40s
test (3.0, windows-latest)	1m 22s
test (3.1, ubuntu-latest)	29s
test (3.1, macos-latest)	42s
test (3.1, windows-latest)	1m 49s
test (3.2, ubuntu-latest)	32s
test (3.2, macos-latest)	39s
test (3.2, windows-latest)	4m 34s
test (head, ubuntu-latest)	36s
test (head, macos-latest)	43s
test (head, windows-latest)	2m 19s
test (jruby, ubuntu-latest)	6m 30s
test (jruby-head, ubuntu-latest)	6m 9s
test (truffleruby, ubuntu-latest)	2m 16s
test (truffleruby-head, ubuntu-latest)	3m 13s
	47m 9s

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