replace deprecated function

Author: jkralik

http-gateway/grpc-websocket-proxy/README.md

@@ -9,7 +9,7 @@ On the wire this uses newline-delimited json encoding of the messages.
 Usage:
 ```diff
 	mux := runtime.NewServeMux()
-	opts := []grpc.DialOption{grpc.WithInsecure()}
+	opts := []grpc.DialOption{grpc.WithTransportCredentials(insecure.NewCredentials())}
 	if err := echoserver.RegisterEchoServiceHandlerFromEndpoint(ctx, mux, *grpcAddr, opts); err != nil {
 		return err
 	}

pkg/net/grpc/stub_test.go

@@ -3,6 +3,7 @@ package grpc_test
 import (
 	"github.com/plgd-dev/hub/pkg/net/grpc/server"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
 )
 
 func StubGrpcServer(opts ...grpc.ServerOption) *server.Server {
@@ -16,7 +17,7 @@ func StubGrpcServer(opts ...grpc.ServerOption) *server.Server {
 }
 
 func StubGrpcClient(addr string) StubServiceClient {
-	conn, err := grpc.Dial(addr, grpc.WithInsecure())
+	conn, err := grpc.Dial(addr, grpc.WithTransportCredentials(insecure.NewCredentials()))
 	if err != nil {
 		panic(err)
 	}