test

Bump up v1.8.1 #134

Job	Run time
ruby-versions / Generate Ruby versions	4s
test (2.5, ubuntu-latest)	26s
test (2.5, windows-latest)	2m 44s
test (2.6, ubuntu-latest)	28s
test (2.6, macos-latest)	50s
test (2.6, windows-latest)	3m 11s
test (2.7, ubuntu-latest)	28s
test (2.7, macos-latest)	29s
test (2.7, windows-latest)	3m 22s
test (3.0, ubuntu-latest)	18s
test (3.0, macos-latest)	17s
test (3.0, windows-latest)	1m 50s
test (3.1, ubuntu-latest)	24s
test (3.1, macos-latest)	17s
test (3.1, windows-latest)	1m 5s
test (3.2, ubuntu-latest)	20s
test (3.2, macos-latest)	20s
test (3.2, windows-latest)	3m 12s
test (3.3, ubuntu-latest)	18s
test (3.3, macos-latest)	17s
test (3.3, windows-latest)	1m 43s
test (head, ubuntu-latest)	19s
test (head, macos-latest)	18s
test (head, windows-latest)	1m 30s
test (jruby, ubuntu-latest)	4m 45s
test (jruby-head, ubuntu-latest)	4m 51s
test (truffleruby, ubuntu-latest)	1m 41s
test (truffleruby-head, ubuntu-latest)	1m 54s
	37m 41s

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