Fixed branch in travis config
Fixed branch in travis config

OAkyildiz/walrus,RIVeR-Lab/walrus,OAkyildiz/walrus,OAkyildiz/walrus,OAkyildiz/walrus,RIVeR-Lab/walrus,OAkyildiz/walrus,RIVeR-Lab/walrus,RIVeR-Lab/walrus,RIVeR-Lab/walrus,RIVeR-Lab/walrus,OAkyildiz/walrus,OAkyildiz/walrus,RIVeR-Lab/walrus