Tests

Update README and Changelog for release. #43

Job	Run time
test (ubuntu, 3.0)	13s
test (ubuntu, 3.3)	25s
test (ubuntu, 3.4)	20s
test (ubuntu, head)	7s
test (ubuntu, 3.1)	16s
test (ubuntu, jruby)	1m 7s
test (ubuntu, 3.2)	17s
test (ubuntu, truffleruby-head)	22s
test (windows, 3.0)	53s
test (macos, 3.0)	19s
test (ubuntu, jruby-head)	1m 7s
test (ubuntu, truffleruby)	30s
finish	5s
	6m 1s

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