Update configuration.md
Update configuration.md

Useless comment if wrong
liip/LiipImagineBundle,liip/LiipImagineBundle,prolixtechnikos/LiipImagineBundle,prolixtechnikos/LiipImagineBundle,prolixtechnikos/LiipImagineBundle,robfrawley/LiipImagineBundle,robfrawley/LiipImagineBundle