update phpunit version info
Created by: eileenmcnaughton
The docs say buildkit ships with phpunit4 but I think this is out of date.
For the record to avoid errors about PHPUnit_Extensions_Database_TestCase on php 7.2 I had to use the following in composer.json
{
"require": {
"phpunit/dbunit": "~2",
"phpunit/phpunit": "~5"
}
}
Officially phpunit 5 doesn't work with php 7.2 https://phpunit.de/supported-versions.html but it's the only combo I could get working