Updated behat dependency
Updated behat dependency

2.4.* instead of 2.4, which apparently makes a difference for composer...

chillu/silverstripe-behat-extension,jeffreyguo/silverstripe-behat-extension,silverstripe/silverstripe-behat-extension,jeffreyguo/SS-Behat-quicksetup,IgorNadj/silverstripe-behat-extension,silverstripe-labs/silverstripe-behat-extension,silverstripe/silverstripe-behat-extension,jeffreyguo/SS-Behat-quicksetup,tractorcow/silverstripe-behat3,benmanu/silverstripe-behat-extension