[wp-trac] [WordPress Trac] #41472: Travis CI: Use the latest PHPUnit 6.x branch

[WordPress Trac]

#41472: Travis CI: Use the latest PHPUnit 6.x branch
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 Reporter:  netweb            |       Owner:  johnbillion
     Type:  defect (bug)      |      Status:  reviewing
 Priority:  normal            |   Milestone:  4.9
Component:  Build/Test Tools  |     Version:
 Severity:  normal            |  Resolution:
 Keywords:  has-patch commit  |     Focuses:
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Changes (by johnbillion):

 * owner:   => johnbillion
 * status:  new => reviewing


Comment:

 I'm confident in PHPUnit's ability to follow semver without breaking
 compatibility within a major version, so let's do this.

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Ticket URL: <https://core.trac.wordpress.org/ticket/41472#comment:4>
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