travis: re-enable megacheck linter in gometalinter
travis: re-enable megacheck linter in gometalinter

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