Replace deprecated grpc.DialContext with NewClient (#168)

* Replace depr DialContext with NewClient

* Update README.md

README.md

@@ -11,7 +11,7 @@ This repository provides a [`logr.Logger`] that exports recorded messages as [Op
 A working gRPC connection to an OTLP receiving endpoint is needed to setup the logger.
 
 ```go
-conn, _ := grpc.DialContext(ctx, otlpTarget)
+conn, _ := grpc.NewClient(otlpTarget)
 ```
 
 Create a [`logr.Logger`] with this connection.

example/main.go

@@ -33,6 +33,7 @@ import (
 	semconv "go.opentelemetry.io/otel/semconv/v1.12.0"
 	"go.opentelemetry.io/otel/trace"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
 )
 
 const (
@@ -98,7 +99,10 @@ func main() {
 	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt)
 	defer stop()
 
-	conn, err := grpc.DialContext(ctx, *targetPtr, grpc.WithBlock(), grpc.WithInsecure())
+	conn, err := grpc.NewClient(
+		*targetPtr,
+		grpc.WithTransportCredentials(insecure.NewCredentials()),
+	)
 	if err != nil {
 		log.Fatal(err)
 	}