deprecate Negotiator.NegotiateLazy (#249)

core/protocol/switch.go

@@ -51,14 +51,15 @@ type Router interface {
 // Negotiator is a component capable of reaching agreement over what protocols
 // to use for inbound streams of communication.
 type Negotiator interface {
-
 	// NegotiateLazy will return the registered protocol handler to use
 	// for a given inbound stream, returning as soon as the protocol has been
 	// determined. Returns an error if negotiation fails.
 	//
 	// NegotiateLazy may return before all protocol negotiation responses have been
 	// written to the stream. This is in contrast to Negotiate, which will block until
 	// the Negotiator is finished with the stream.
+	//
+	// Deprecated: use Negotiate instead.
 	NegotiateLazy(rwc io.ReadWriteCloser) (io.ReadWriteCloser, string, HandlerFunc, error)
 
 	// Negotiate will return the registered protocol handler to use for a given