Bump up v0.5.0 #501

Job	Run time
ruby-versions / Generate Ruby versions	7s
test (2.6 / ubuntu-latest)	35s
test (2.6 / macos-latest)	44s
test (2.6 / windows-latest)	2m 8s
test (2.7 / ubuntu-latest)	36s
test (2.7 / macos-latest)	44s
test (2.7 / windows-latest)	3m 32s
test (3.0 / ubuntu-latest)	4m 56s
test (3.0 / macos-latest)	27s
test (3.0 / windows-latest)	1m 16s
test (3.1 / ubuntu-latest)	25s
test (3.1 / macos-latest)	26s
test (3.1 / windows-latest)	1m 14s
test (3.2 / ubuntu-latest)	23s
test (3.2 / macos-latest)	27s
test (3.2 / windows-latest)	1m 33s
test (3.3 / ubuntu-latest)	21s
test (3.3 / macos-latest)	27s
test (3.3 / windows-latest)	1m 44s
test (head / ubuntu-latest)	4m 25s
test (head / macos-latest)	27s
test (head / windows-latest)	1m 37s
	28m 34s

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