Pin dependency phpunit/phpunit to v5.7.27 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
phpunit/phpunit (source)	require-dev	pin	4.* \|\| 5.* -> 5.7.27

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Add the preset :preserveSemverRanges to your config if you don't want to pin your dependencies.

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