Test with new ruby and rails versions #265

Job	Run time
tests (3.2, 7.2)	5m 35s
tests (3.1, 7.1)	5m 21s
tests (3.1, 7.2)	5m 35s
tests (3.3, 7.2)	6m 1s
tests (3.2, 7.1)	5m 13s
tests (3.2, 8.0)	5m 20s
tests (3.3, 7.1)	5m 12s
tests (3.4, 7.1)	5m 33s
tests (3.3, 8.0)	5m 43s
tests (3.2, edge)	14s
tests (3.3, edge)	15s
tests (head, 7.2)	12s
tests (head, 8.0)	8s
tests (3.4, 7.2)	5m 52s
tests (3.4, 8.0)	5m 46s
tests (3.3, 7.1, --enable-frozen-string-literal)	5m 28s
tests (3.4, edge)	10s
tests (head, 7.1)	11s
tests (head, edge)	10s
	1h 7m 59s

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