Bump up 0.6.0 #524

Job	Run time
ruby-versions / Generate Ruby versions	2s
test (2.6 / ubuntu-latest)	34s
test (2.6 / macos-latest)	42s
test (2.6 / windows-latest)	2m 56s
test (2.7 / ubuntu-latest)	36s
test (2.7 / macos-latest)	42s
test (2.7 / windows-latest)	2m 54s
test (3.0 / ubuntu-latest)	21s
test (3.0 / macos-latest)	25s
test (3.0 / windows-latest)	1m 21s
test (3.1 / ubuntu-latest)	23s
test (3.1 / macos-latest)	24s
test (3.1 / windows-latest)	1m 12s
test (3.2 / ubuntu-latest)	26s
test (3.2 / macos-latest)	24s
test (3.2 / windows-latest)	1m 53s
test (3.3 / ubuntu-latest)	22s
test (3.3 / macos-latest)	26s
test (3.3 / windows-latest)	2m 28s
test (head / ubuntu-latest)	23s
test (head / macos-latest)	26s
test (head / windows-latest)	1m 29s
	20m 49s

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