Bump up v0.3.8 #145

Job	Run time
ruby-versions / Generate Ruby versions	3s
build (2.6 / ubuntu-latest)	32s
build (2.6 / macos-latest)	53s
build (2.6 / windows-latest)	2m 49s
build (2.7 / ubuntu-latest)	36s
build (2.7 / macos-latest)	33s
build (2.7 / windows-latest)	1m 59s
build (3.0 / ubuntu-latest)	24s
build (3.0 / macos-latest)	20s
build (3.0 / windows-latest)	1m 37s
build (3.1 / ubuntu-latest)	21s
build (3.1 / macos-latest)	31s
build (3.1 / windows-latest)	1m 40s
build (3.2 / ubuntu-latest)	26s
build (3.2 / macos-latest)	29s
build (3.2 / windows-latest)	1m 21s
build (3.3 / ubuntu-latest)	19s
build (3.3 / macos-latest)	24s
build (3.3 / windows-latest)	3m 21s
build (head / ubuntu-latest)	20s
build (head / macos-latest)	21s
build (head / windows-latest)	1m 13s
	20m 32s

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