Tests

Use Chocolatey to install bzip2.dll for Windows tests in CI. #26

Job	Run time
test (ubuntu, 3.0)	12s
test (ubuntu, truffleruby)	25s
test (ubuntu, 3.4)	20s
test (ubuntu, head)	8s
test (ubuntu, 3.2)	14s
test (ubuntu, jruby-head)	1m 10s
test (ubuntu, 3.1)	12s
test (ubuntu, truffleruby-head)	23s
test (ubuntu, 3.3)	25s
test (ubuntu, jruby)	1m 2s
test (macos, 3.0)	17s
test (windows, 3.0)	1m 9s
finish	3s
	6m 0s

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