Tests

Add a test to ensure correct version number format. #8

Job	Run time
test (ubuntu, 2.4)	23s
test (ubuntu, 2.5)	28s
test (ubuntu, 2.6)	30s
test (ubuntu, 2.7)	30s
test (ubuntu, 3.0)	12s
test (ubuntu, 3.1)	13s
test (ubuntu, 3.2)	17s
test (ubuntu, 3.3)	21s
test (ubuntu, 3.4)	23s
test (ubuntu, head)	7s
test (ubuntu, jruby)	47s
test (ubuntu, jruby-head)	48s
test (ubuntu, truffleruby)	24s
test (ubuntu, truffleruby-head)	26s
test (macos, 2.6)	31s
test (windows, 2.4.10)	1m 35s
finish	4s
	7m 59s

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