Tests

Use Chocolatey to install bzip2.dll for Windows tests in CI. #29

Job	Run time
test (ubuntu, 3.0)	18s
test (ubuntu, 3.2)	14s
test (ubuntu, truffleruby)	28s
test (ubuntu, head)	8s
test (ubuntu, jruby)	1m 2s
test (ubuntu, jruby-head)	1m 4s
test (ubuntu, 3.1)	12s
test (ubuntu, 3.4)	23s
test (windows, 3.0)	1m 2s
test (ubuntu, 3.3)	24s
test (ubuntu, truffleruby-head)	26s
test (macos, 3.0)	18s
finish	4s
	6m 3s

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