major codec upgrade

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

network/transport/options.go

@@ -14,7 +14,7 @@ type Options struct {
 	Addrs []string
 	// Codec is the codec interface to use where headers are not supported
 	// by the transport and the entire payload must be encoded
-	Codec codec.Marshaler
+	Codec codec.Codec
 	// Secure tells the transport to secure the connection.
 	// In the case TLSConfig is not specified best effort self-signed
 	// certs should be used
@@ -121,7 +121,7 @@ func Context(ctx context.Context) Option {
 
 // Codec sets the codec used for encoding where the transport
 // does not support message headers
-func Codec(c codec.Marshaler) Option {
+func Codec(c codec.Codec) Option {
 	return func(o *Options) {
 		o.Codec = c
 	}

network/tunnel/tunnel.go

@@ -46,7 +46,7 @@ var (
 // Mode of the session
 type Mode uint8
 
-// Tunnel creates a gre tunnel on top of the go-micro/transport.
+// Tunnel creates a gre tunnel on top of the micro/transport.
 // It establishes multiple streams using the Micro-Tunnel-Channel header
 // and Micro-Tunnel-Session header. The tunnel id is a hash of
 // the address being requested.