Fixed double assignment #47

Job	Run time
ruby-versions / Generate Ruby versions	3s
build (2.4 / ubuntu-latest)	17s
build (2.4 / windows-latest)	1m 27s
build (2.5 / ubuntu-latest)	21s
build (2.5 / windows-latest)	2m 21s
build (2.6 / ubuntu-latest)	21s
build (2.6 / macos-latest)	30s
build (2.6 / windows-latest)	2m 22s
build (2.7 / ubuntu-latest)	21s
build (2.7 / macos-latest)	22s
build (2.7 / windows-latest)	1m 36s
build (3.0 / ubuntu-latest)	5s
build (3.0 / macos-latest)	7s
build (3.0 / windows-latest)	1m 7s
build (3.1 / ubuntu-latest)	6s
build (3.1 / macos-latest)	9s
build (3.1 / windows-latest)	1m 8s
build (3.2 / ubuntu-latest)	7s
build (3.2 / macos-latest)	7s
build (3.2 / windows-latest)	1m 23s
build (3.3 / ubuntu-latest)	5s
build (3.3 / macos-latest)	8s
build (3.3 / windows-latest)	1m 14s
build (head / ubuntu-latest)	5s
build (head / macos-latest)	9s
build (head / windows-latest)	56s
	16m 57s

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