Update composer on travis
Update composer on travis

ksom/DoctrineBehaviors,bocharsky-bw/DoctrineBehaviors,MakG10/DoctrineBehaviors,shieldo/DoctrineBehaviors,vba-ds/DoctrineBehaviors,lemoinem/DoctrineBehaviors,DerekRoth/DoctrineBehaviors,KnpLabs/DoctrineBehaviors,MAXakaWIZARD/DoctrineBehaviors