Updated README
Updated README

erikaheidi/StofDoctrineExtensionsBundle,romaricdrigon/StofDoctrineExtensionsBundle,alterphp/StofDoctrineExtensionsBundle,OskarStark/StofDoctrineExtensionsBundle,jhcasado/StofDoctrineExtensionsBundle,stof/StofDoctrineExtensionsBundle,felicitus/StofDoctrineExtensionsBundle,IWAtech/StofDoctrineExtensionsBundle,mcfedr/StofDoctrineExtensionsBundle