Update version compatibility #258

Job	Run time
tests (3.2, edge)	26s
tests (3.2, 7.1)	5m 18s
tests (3.1, 7.1)	5m 23s
tests (3.3, 7.1, --enable-frozen-string-literal)	5m 46s
tests (head, 7.1)	7s
tests (head, edge)	12s
	17m 12s

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