Update travis configuration as the build failed

[jmaitrehenry]

$ go version
go version go1.7 linux/amd64
go.env
$ go env
install
0.00s$ export GO15VENDOREXPERIMENT=1
3.84s$ go get -u github.com/golang/lint/golint
# golang.org/x/tools/go/internal/gcimporter
../../../golang.org/x/tools/go/internal/gcimporter/bexport.go:212: obj.IsAlias undefined (type *types.TypeName has no field or method IsAlias)
The command "go get -u github.com/golang/lint/golint" failed and exited with 2 during .