Change to code snippet compatible with ZIO 2 (zio#1398)

README.md

@@ -28,17 +28,18 @@ Check out the full documentation here: [Documentation]
 A simple Http server can be built using a few lines of code.
 
 ```scala
-import zio._
 import zhttp.http._
 import zhttp.service.Server
+import zio._
+
+object HelloWorld extends ZIOAppDefault {
 
-object HelloWorld extends App {
- val app = Http.collect[Request] {
+ val app: HttpApp[Any, Nothing] = Http.collect[Request] {
  case Method.GET -> !! / "text" => Response.text("Hello World!")
  }
 
- override def run(args: List[String]): URIO[zio.ZEnv, ExitCode] =
- Server.start(8090, app).exitCode
+ override val run =
+ Server.start(8090, app)
 }
 ```
 #### Examples