Updated the bundle's installation instructions
Updated the bundle's installation instructions

stof/KnpMenuBundle,Soullivaneuh/KnpMenuBundle,javiereguiluz/KnpMenuBundle,KnpLabs/KnpMenuBundle,piotrantosik/KnpMenuBundle,Soullivaneuh/KnpMenuBundle,bocharsky-bw/KnpMenuBundle,benji07/KnpMenuBundle