change "github.com/golang" to "golang.org/x"

[tarekbadrshalaan]

there is issue about import from github.com/golang/net/websocket I don't know why. but as you can find here https://github.com/golang/net it talks about [mirror] at https://godoc.org/golang.org/x/net. when in change the import, it worked.

also there is an issue in messages duplication if you allow me i will try to fix.