Try again with aliases option for permitted classes #368

Job	Run time
ruby-versions / Generate Ruby versions	4s
build (2.5, 0.1.7, /tmp/local)	1m 7s
build (2.5, 0.1.7)	34s
build (2.5, 0.2.5, /tmp/local)	54s
build (2.5, 0.2.5)	1m 4s
build (2.6, 0.1.7, /tmp/local)	1m 5s
build (2.6, 0.1.7)	38s
build (2.6, 0.2.5, /tmp/local)	1m 0s
build (2.6, 0.2.5)	37s
build (2.7, 0.1.7, /tmp/local)	55s
build (2.7, 0.1.7)	34s
build (2.7, 0.2.5, /tmp/local)	1m 4s
build (2.7, 0.2.5)	36s
build (3.0, 0.1.7, /tmp/local)	26s
build (3.0, 0.1.7)	31s
build (3.0, 0.2.5, /tmp/local)	31s
build (3.0, 0.2.5)	36s
build (3.1, 0.1.7, /tmp/local)	40s
build (3.1, 0.1.7)	26s
build (3.1, 0.2.5, /tmp/local)	49s
build (3.1, 0.2.5)	21s
build (3.2, 0.1.7, /tmp/local)	32s
build (3.2, 0.1.7)	32s
build (3.2, 0.2.5, /tmp/local)	36s
build (3.2, 0.2.5)	25s
build (3.3, 0.1.7, /tmp/local)	30s
build (3.3, 0.1.7)	21s
build (3.3, 0.2.5, /tmp/local)	31s
build (3.3, 0.2.5)	21s
build (head, 0.1.7, /tmp/local)	25s
build (head, 0.1.7)	22s
build (head, 0.2.5, /tmp/local)	29s
build (head, 0.2.5)	25s
	20m 1s

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