Update travis go version
Update travis go version

OpenBazaar/openbazaar-go,gubatron/openbazaar-go,gubatron/openbazaar-go,hoffmabc/openbazaar-go,hoffmabc/openbazaar-go,gubatron/openbazaar-go,OpenBazaar/openbazaar-go,hoffmabc/openbazaar-go,OpenBazaar/openbazaar-go