UPGRADE

FROM `1.x` TO `2.x`

Change required package from lakion/mink-debug-extension to friends-of-behat/mink-debug-extension in your composer.json
Change extension name from Lakion\Behat\MinkDebugExtension to FriendsOfBehat\MinkDebugExtension in your behat.yml
Make sure you're not using binaries provided by 1.x version of this library