Replaces several behat/ components for an friends-of-behat equivalents, as the original component doesn't yet support Symfony 5; Also had to add friends-of-behat/mink-browserkit-driver as a dev dependency for the same reason.
Removes Symfony <3.4 support
Updated a number of components minimum version numbers.
behat/components for anfriends-of-behatequivalents, as the original component doesn't yet support Symfony 5; Also had to addfriends-of-behat/mink-browserkit-driveras a dev dependency for the same reason.