Fix Java version parsing and add some tests for it #10
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The attempted fix in 357a0ca doesn't actually work, since regex_captures destructures to
(whole, first group, second group)
, and the first part was being treated as the major version (instead of the second part). This makes both the major and minor version be parsed as 24. This PR fixes that, moves the parsing code to a separate function, and adds a few tests for some Java versions I have installed.