move to v4

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

util/http/clienttracer.go

@@ -23,7 +23,7 @@ import (
 	"strings"
 	"sync"
 
-	"go.unistack.org/micro/v3/tracer"
+	"go.unistack.org/micro/v4/tracer"
 )
 
 const (

util/http/http.go

@@ -8,8 +8,8 @@ import (
 	"net/http"
 	"strings"
 
-	"go.unistack.org/micro/v3/metadata"
-	"go.unistack.org/micro/v3/selector/random"
+	"go.unistack.org/micro/v4/metadata"
+	"go.unistack.org/micro/v4/selector/random"
 )
 
 // Write sets the status and body on a http ResponseWriter

util/http/http_test.go

@@ -9,10 +9,10 @@ import (
 	"net/http"
 	"testing"
 
-	"go.unistack.org/micro/v3/register"
-	"go.unistack.org/micro/v3/register/memory"
-	"go.unistack.org/micro/v3/router"
-	regRouter "go.unistack.org/micro/v3/router/register"
+	"go.unistack.org/micro/v4/register"
+	"go.unistack.org/micro/v4/register/memory"
+	"go.unistack.org/micro/v4/router"
+	regRouter "go.unistack.org/micro/v4/router/register"
 )
 
 func TestRoundTripper(t *testing.T) {

util/http/options.go

@@ -1,6 +1,6 @@
 package http
 
-import "go.unistack.org/micro/v3/router"
+import "go.unistack.org/micro/v4/router"
 
 // Options struct
 type Options struct {

util/http/roundtripper.go

@@ -4,8 +4,8 @@ import (
 	"errors"
 	"net/http"
 
-	"go.unistack.org/micro/v3/router"
-	"go.unistack.org/micro/v3/selector"
+	"go.unistack.org/micro/v4/router"
+	"go.unistack.org/micro/v4/selector"
 )
 
 type roundTripper struct {