Travis build fails due Go version

[torano-toby]

Travis is currently building on versions 1.5 and 1.6 of Go, however runtime.KeepAlive is only present in versions 1.7+ of Go, as referenced here.

This is making most builds fail I think. Error can be seen for the missing field here

# golang.org/x/sys/unix

../../../golang.org/x/sys/unix/ioctl.go:18: undefined: runtime.KeepAlive

../../../golang.org/x/sys/unix/ioctl.go:28: undefined: runtime.KeepAlive

../../../golang.org/x/sys/unix/syscall_linux.go:99: undefined: runtime.KeepAlive

github.com/canthefason/go-watcher/docker-examples/hello

github.com/canthefason/go-watcher/vendor/gopkg.in/fsnotify.v1

The command "eval go get -v -t ./... " failed. Retrying, 2 of 3.