Tests

Update installation of bzip2 in windows tests. #42

Job	Run time
test (ubuntu, 3.0)	19s
test (ubuntu, 3.3)	22s
test (ubuntu, 3.1)	13s
test (ubuntu, jruby)	59s
test (ubuntu, head)	8s
test (ubuntu, truffleruby)	26s
test (ubuntu, 3.2)	19s
test (windows, 3.0)	55s
test (macos, 3.0)	19s
test (ubuntu, 3.4)	23s
test (ubuntu, truffleruby-head)	23s
test (ubuntu, jruby-head)	1m 12s
finish	4s
	6m 2s

Provide feedback