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Update version numbers to fix failing tests
Properly sort WordPress versions

`version_compare()` can return `-1` or `0`, both of which are falsy.
This caused inconsistent results when the WordPress API started
returning versions out of order
Merge pull request #1513 from wp-cli/update-tests

Fix failing tests due to WordPress version update
Merge pull request #1504 from szepeviktor/patch-12

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