travis: fix stderr redirect on apt-get install
travis: fix stderr redirect on apt-get install

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