more IAsyncDisposable stuff

Examples/Program_DownloadSavedMedia.cs

@@ -11,7 +11,7 @@ namespace WTelegramClientTest
 		static async Task Main(string[] _)
 		{
 			Console.WriteLine("The program will download photos/medias from messages you send/forward to yourself (Saved Messages)");
-			using var client = new WTelegram.Client(Environment.GetEnvironmentVariable);
+			await using var client = new WTelegram.Client(Environment.GetEnvironmentVariable);
 			var user = await client.LoginUserIfNeeded();
 			client.OnUpdates += Client_OnUpdates;
 			Console.ReadKey();

Examples/Program_GetAllChats.cs

@@ -24,7 +24,7 @@ namespace WTelegramClientTest
 
 		static async Task Main(string[] _)
 		{
-			using var client = new WTelegram.Client(Config);
+			await using var client = new WTelegram.Client(Config);
 			var user = await client.LoginUserIfNeeded();
 			Console.WriteLine($"We are logged-in as {user.username ?? user.first_name + " " + user.last_name} (id {user.id})");
 

Examples/Program_Heroku.cs

@@ -28,7 +28,7 @@ namespace WTelegramClientTest
 			var store = new PostgreStore(Environment.GetEnvironmentVariable("DATABASE_URL"), Environment.GetEnvironmentVariable("SESSION_NAME"));
 			// if DB does not contain a session yet, client will be run in interactive mode
 			Client = new WTelegram.Client(store.Length == 0 ? null : Environment.GetEnvironmentVariable, store);
-			using (Client)
+			await using (Client)
 			{
 				Client.OnUpdates += Client_OnUpdates;
 				My = await Client.LoginUserIfNeeded();

Examples/Program_ListenUpdates.cs

@@ -16,7 +16,7 @@ namespace WTelegramClientTest
 			Console.WriteLine("The program will display updates received for the logged-in user. Press any key to terminate");
 			WTelegram.Helpers.Log = (l, s) => System.Diagnostics.Debug.WriteLine(s);
 			Client = new WTelegram.Client(Environment.GetEnvironmentVariable);
-			using (Client)
+			await using (Client)
 			{
 				Manager = Client.WithUpdateManager(Client_OnUpdate/*, "Updates.state"*/);
 				My = await Client.LoginUserIfNeeded();

Examples/Program_ReactorError.cs

@@ -20,7 +20,7 @@ namespace WTelegramClientTest
 			}
 			finally
 			{
-				Client?.Dispose();
+				if (Client != null) await Client.DisposeAsync();
 			}
 		}
 
@@ -42,7 +42,7 @@ namespace WTelegramClientTest
 				while (true)
 				{
 					Console.WriteLine("Disposing the client and trying to reconnect in 5 seconds...");
-					Client?.Dispose();
+					if (Client != null) await Client.DisposeAsync();
 					Client = null;
 					await Task.Delay(5000);
 					try

src/Client.cs

@@ -20,7 +20,10 @@ using static WTelegram.Encryption;
 
 namespace WTelegram
 {
-	public partial class Client : IDisposable, IAsyncDisposable
+	public partial class Client : IDisposable
+#if NETCOREAPP2_1_OR_GREATER
+		, IAsyncDisposable
+#endif
 	{
 		/// <summary>This event will be called when unsollicited updates/messages are sent by Telegram servers</summary>
 		/// <remarks>Make your handler <see langword="async"/>, or return <see cref="Task.CompletedTask"/> or <see langword="null"/><br/>See <see href="https://github.com/wiz0u/WTelegramClient/blob/master/Examples/Program_ReactorError.cs?ts=4#L30">Examples/Program_ReactorError.cs</see> for how to use this<br/>or <see href="https://github.com/wiz0u/WTelegramClient/blob/master/Examples/Program_ListenUpdates.cs?ts=4#L21">Examples/Program_ListenUpdate.cs</see> using the UpdateManager class instead</remarks>