v3 refactor (#1868)

* Move to v3

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

server/mock/mock.go

@@ -5,7 +5,7 @@ import (
 	"sync"
 
 	"github.com/google/uuid"
-	"github.com/micro/go-micro/v2/server"
+	"github.com/micro/go-micro/v3/server"
 )
 
 type MockServer struct {

server/mock/mock_handler.go

@@ -1,8 +1,8 @@
 package mock
 
 import (
-	"github.com/micro/go-micro/v2/registry"
-	"github.com/micro/go-micro/v2/server"
+	"github.com/micro/go-micro/v3/registry"
+	"github.com/micro/go-micro/v3/server"
 )
 
 type MockHandler struct {

server/mock/mock_subscriber.go

@@ -1,8 +1,8 @@
 package mock
 
 import (
-	"github.com/micro/go-micro/v2/registry"
-	"github.com/micro/go-micro/v2/server"
+	"github.com/micro/go-micro/v3/registry"
+	"github.com/micro/go-micro/v3/server"
 )
 
 type MockSubscriber struct {

server/mock/mock_test.go

@@ -3,7 +3,7 @@ package mock
 import (
 	"testing"
 
-	"github.com/micro/go-micro/v2/server"
+	"github.com/micro/go-micro/v3/server"
 )
 
 func TestMockServer(t *testing.T) {