add a note about changed logger interface
add a note about changed logger interface

prolixtechnikos/LiipImagineBundle,robfrawley/LiipImagineBundle,prolixtechnikos/LiipImagineBundle,liip/LiipImagineBundle,prolixtechnikos/LiipImagineBundle,liip/LiipImagineBundle,robfrawley/LiipImagineBundle