Bump up v0.3.1 #93

Job	Run time
ruby-versions / Generate Ruby versions	2s
build (2.6 / ubuntu-latest)	18s
build (2.6 / macos-latest)	51s
build (2.6 / windows-latest)	2m 29s
build (2.7 / ubuntu-latest)	20s
build (2.7 / macos-latest)	38s
build (2.7 / windows-latest)	1m 51s
build (3.0 / ubuntu-latest)	8s
build (3.0 / macos-latest)	12s
build (3.0 / windows-latest)	2m 24s
build (3.1 / ubuntu-latest)	5s
build (3.1 / macos-latest)	13s
build (3.1 / windows-latest)	1m 18s
build (3.2 / ubuntu-latest)	7s
build (3.2 / macos-latest)	14s
build (3.2 / windows-latest)	1m 9s
build (head / ubuntu-latest)	5s
build (head / macos-latest)	11s
build (head / windows-latest)	1m 16s
	13m 51s

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