travis: add go 1.7 beta1
travis: add go 1.7 beta1

guilhermebr/tsuru,guilhermebr/tsuru,cezarsa/tsuru,gwmoura/tsuru,guilhermebr/tsuru,ArxdSilva/tsuru,tsuru/tsuru,tsuru/tsuru,gwmoura/tsuru,ggarnier/tsuru,ArxdSilva/tsuru,cezarsa/tsuru,cezarsa/tsuru,tsuru/tsuru,tsuru/tsuru,cezarsa/tsuru,guilhermebr/tsuru,ggarnier/tsuru,ArxdSilva/tsuru,ggarnier/tsuru,ArxdSilva/tsuru,ggarnier/tsuru,gwmoura/tsuru