Fix typo in README.md

Author: marcominerva

README.md

@@ -42,7 +42,6 @@ Authentication can be totally configured adding an _Authentication_ section in t
         "Audiences": [ "audience" ], // Optional
         "ExpirationTime": "01:00:00", // Default: No expiration
         "ClockSkew": "00:02:00", // Default: 5 minutes
-        "EnableJwtBearerService": true // Default: true
     },
     "ApiKey": {
         "SchemeName": "ApiKey", // Default: ApiKey
@@ -142,7 +141,7 @@ builder.Services.AddOpenApi(options =>
 When using JWT Bearer authentication, you can set the _EnableJwtBearerService_ setting to _true_ to automatically register an implementation of the [IJwtBearerService](https://github.com/marcominerva/SimpleAuthentication/blob/master/src/SimpleAuthentication.Abstractions/JwtBearer/IJwtBearerService.cs) interface to create a valid JWT Bearer, according to the setting you have specified in the _appsettings.json_ file:
 
 ```csharp
-app.MapPost("api/auth/login", (LoginRequest loginRequest, IJwtBearerService jwtBearerService) =>
+app.MapPost("api/auth/login", async (LoginRequest loginRequest, IJwtBearerService jwtBearerService) =>
 {
     // Check for login rights...
 
@@ -153,7 +152,7 @@ app.MapPost("api/auth/login", (LoginRequest loginRequest, IJwtBearerService jwtB
         new(ClaimTypes.Surname, "Minerva")
     };
 
-    var token = jwtBearerService.CreateToken(loginRequest.UserName, claims);
+    var token = await jwtBearerService.CreateTokenAsync(loginRequest.UserName, claims);
     return TypedResults.Ok(new LoginResponse(token));
 });