Update readme

src/HealthChecks.Nats/README.md

@@ -1,50 +1,36 @@
 # NATS Health Check
 
 This health check verifies the ability to communicate with a [NATS server](https://nats.io/about/). \
-It relies on `NATS.Client` package. \
+It relies on `NATS.Net` package. \
 Latest tag for the [official dockerhub image](https://hub.docker.com/_/nats/) is `2.6.6`.
 
 ## Builder Extension
 
 ```csharp
 public void ConfigureServices(IServiceCollection services)
 {
+    var options = NatsOpts.Default with
+    {
+      Url = "nats://demo.nats.io:4222"
+    };
+
     services
+        .AddSingleton<INatsConnection>(new NatsConnection(options))
         .AddHealthChecks()
-        .AddNats(options =>
-        {
-            options.Url = "nats://demo.nats.io:4222";
-            options.CredentialsPath = "The full path to a chained credentials file.";
-            options.Jwt = "The path to a user's public JWT credentials.";
-            options.PrivateNKey = "The path to a file for user user's private Nkey seed.";
-        });
+        .AddNats();
 }
 ```
 
 `Url` property is NATS server url and is **mandatory**. \
 There is a demo instance `nats://demo.nats.io:4222` managed by nats.io and this is the default value for the url property. \
-The rest of the properties in `NatsOptions` are optional. \
+The rest of the properties in `NatsOpts` are optional. \
 Docker image produces `nats://localhost:4222`. \
 Url might also be a string containing multiple URLs to the NATS Server, e.g. `nats://localhost:4222, nats://localhost:8222`.
 
 See [NKeys](https://docs.nats.io/running-a-nats-service/configuration/securing_nats/auth_intro/nkey_auth) for reference to the `PrivateNKey` and `Jwt` properties.
 
 See [Authenticating with a Credentials File](https://docs.nats.io/using-nats/developer/connecting/creds) for details related to the `CredentialsPath` property.
 
-The setup action used by the extension method caters for all three overloads supplied by the Nats client to create a connection off of a connection factory.
-
-```csharp
-namespace NATS.Client
-{
-    public sealed class ConnectionFactory
-    {
-        public IConnection CreateConnection(string url);
-        public IConnection CreateConnection(string url, string credentialsPath);
-        public IConnection CreateConnection(string url, string jwt, string privateNkey);
-    }
-}
-```
-
 Like all `IHealthChecksBuilder` extensions, all the following parameters have type `default` values and may be overridden:
 
 - `name`: The health check name. Default if not specified is `nats`.