travis: disable check-handler for now
travis: disable check-handler for now

See golang/go#12459.

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