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What problem is this PR intended to solve?
It updates the Appveyor setup to check the build and the test suite on supported MRI ruby versions.
Since https://ci.nokogiri.org doesn't do any tests on Windows currently, I propose to add Appveyor in the meantime instead to nokogiris github repository.
Does this change affect the C or the Java implementations?
Appveyor-CI setup currently runs MRI only and doesn't run JRuby.