Change default namespace of migration to App
Change default namespace of migration to App

lchrusciel/Sylius-Standard,rpg600/Sylius-Standard,lchrusciel/Sylius-Standard,akorchaginn/Sylius-Standard,MichaelKubovic/Sylius-Standard,akorchaginn/Sylius-Standard,Sylius/Sylius-Standard,akorchaginn/Sylius-Standard,lchrusciel/Sylius-Standard,MichaelKubovic/Sylius-Standard,Sylius/Sylius-Standard,rpg600/Sylius-Standard,lchrusciel/Sylius-Standard,Sylius/Sylius-Standard