travis: added -y on add-apt-repo.
travis: added -y on add-apt-repo.

mderaldo/tsuru,cgvarela/tsuru,kgrvamsi/tsuru,guilhermebr/tsuru,cezarsa/tsuru,gwmoura/tsuru,tsuru/tsuru,Endika/tsuru,tsuru/tsuru,jblancett/tsuru,cezarsa/tsuru,cgvarela/tsuru,hcxiong/tsuru,jblancett/tsuru,4eek/tsuru,tuxmonteiro/tsuru,hugoantunes/tsuru,RichardKnop/tsuru,RichardKnop/tsuru,ArxdSilva/tsuru,cgvarela/tsuru,hcxiong/tsuru,ggarnier/tsuru,mderaldo/tsuru,jblancett/tsuru,kgrvamsi/tsuru,cezarsa/tsuru,hcxiong/tsuru,ArxdSilva/tsuru,ArxdSilva/tsuru,firebitsbr/tsuru,tuxmonteiro/tsuru,gwmoura/tsuru,gwmoura/tsuru,hugoantunes/tsuru,gciotta/tsuru,ggarnier/tsuru,ArxdSilva/tsuru,tsuru/tsuru,Endika/tsuru,4eek/tsuru,guilhermebr/tsuru,cezarsa/tsuru,4eek/tsuru,ggarnier/tsuru,tuxmonteiro/tsuru,firebitsbr/tsuru,firebitsbr/tsuru,guilhermebr/tsuru,Endika/tsuru,RichardKnop/tsuru,gciotta/tsuru,gciotta/tsuru,mderaldo/tsuru,tsuru/tsuru,ggarnier/tsuru,kgrvamsi/tsuru,guilhermebr/tsuru