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Add ruby head version to CI #764

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Run time

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Job	Run time
Linelint	38s
Test 2.7	31s
Profile	57s
Test 3.2	25s
Test head	28s
Test 3.4	44s
Test 3.1	22s
Test 3.0	20s
RuboCop	35s
Test 3.3	29s
	5m 29s