travis: remove go 1.6beta1 from allow_failures
travis: remove go 1.6beta1 from allow_failures

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