v3 refactor (#1868)

* Move to v3

Co-authored-by: Ben Toogood <bentoogood@gmail.com>

router/options.go

@@ -4,7 +4,8 @@ import (
 	"context"
 
 	"github.com/google/uuid"
-	"github.com/micro/go-micro/v2/registry"
+	"github.com/micro/go-micro/v3/registry"
+	"github.com/micro/go-micro/v3/registry/mdns"
 )
 
 // Options are router options
@@ -23,8 +24,8 @@ type Options struct {
 	Advertise Strategy
 	// Context for additional options
 	Context context.Context
-	// Prewarm the route table on router startup
-	Prewarm bool
+	// Precache the route table on router startup
+	Precache bool
 }
 
 // Id sets Router Id
@@ -69,10 +70,10 @@ func Advertise(a Strategy) Option {
 	}
 }
 
-// Prewarm sets whether to prewarm the route table
-func Prewarm(b bool) Option {
+// Precache sets whether to precache the route table
+func Precache(b bool) Option {
 	return func(o *Options) {
-		o.Prewarm = b
+		o.Precache = b
 	}
 }
 
@@ -82,7 +83,7 @@ func DefaultOptions() Options {
 		Id:        uuid.New().String(),
 		Address:   DefaultAddress,
 		Network:   DefaultNetwork,
-		Registry:  registry.DefaultRegistry,
+		Registry:  mdns.NewRegistry(),
 		Advertise: AdvertiseLocal,
 		Context:   context.Background(),
 	}