Change the visibility of WebTestCase::setUp to keep the same as in PHPUnit

see https://github.com/sebastianbergmann/phpunit/blob/ea293f782b3e001c9b7eeb5bdc2d545e4c091fdb/src/Framework/TestCase.php#L1834
minor #936 Change the visibility of WebTestCase::setUp to keep the same as in PHPUnit (lyrixx)

This PR was merged into the 2.0.x-dev branch.

Discussion
----------

Change the visibility of WebTestCase::setUp to keep the same as in PHPUnit

see https://github.com/sebastianbergmann/phpunit/blob/ea293f782b3e001c9b7eeb5bdc2d545e4c091fdb/src/Framework/TestCase.php#L1834

Commits
-------

7cddf2d Change the visibility of WebTestCase::setUp to keep the same as in PHPUnit