travis: remove go 1.3
travis: remove go 1.3

Go 1.3.1 will do the work for us.

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