fix PHP Strict standards error

PHP Strict standards: Declaration of Codeception\Module\PhpBrowser::_before() should be compatible with Codeception\Module::_before(Codeception\TestCase $test) in /home/travis/build/tiger-seo/codeception-remotedebug/vendor/codeception/codeception/src/Codeception/Module/PhpBrowser.php on line 52
Merge pull request #634 from Codeception/1.7

fix PHP Strict standards error