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Set upper boundary of supported PHPUnit versions to <5.4 #3080
It won't do much harm if the users will not be able to upgrade to Phpunit 5.4 for a week. But if someone really want it, they could use the penultimate version of Codeception which has no restriction.
There is a risk and I think that it would be safer to put a restriction. But if you disagree, then we can do nothing and see how it works out.
The most nice change I see in PHPUnit 5.4 is this method https://github.com/sebastianbergmann/phpunit/blob/master/src%2FFramework%2FTestCase.php#L1407