Make clients interfaces disposable.

Frameworks/MQTTnet.NetStandard/Client/IMqttClient.cs

@@ -4,7 +4,7 @@ using System.Threading.Tasks;
 
 namespace MQTTnet.Client
 {
-    public interface IMqttClient : IApplicationMessageReceiver, IApplicationMessagePublisher
+    public interface IMqttClient : IApplicationMessageReceiver, IApplicationMessagePublisher, IDisposable
     {
         bool IsConnected { get; }
 

Frameworks/MQTTnet.NetStandard/Client/MqttClient.cs

@@ -12,7 +12,7 @@ using MQTTnet.Protocol;
 
 namespace MQTTnet.Client
 {
-    public class MqttClient : IMqttClient, IDisposable
+    public class MqttClient : IMqttClient
     {
         private readonly IMqttClientAdapterFactory _adapterFactory;
         private readonly MqttPacketDispatcher _packetDispatcher;

Frameworks/MQTTnet.NetStandard/ManagedClient/IManagedMqttClient.cs

@@ -5,7 +5,7 @@ using MQTTnet.Client;
 
 namespace MQTTnet.ManagedClient
 {
-    public interface IManagedMqttClient : IApplicationMessageReceiver, IApplicationMessagePublisher
+    public interface IManagedMqttClient : IApplicationMessageReceiver, IApplicationMessagePublisher, IDisposable
     {
         bool IsConnected { get; }
 

Frameworks/MQTTnet.NetStandard/ManagedClient/ManagedMqttClient.cs

@@ -11,7 +11,7 @@ using MQTTnet.Protocol;
 
 namespace MQTTnet.ManagedClient
 {
-    public class ManagedMqttClient : IManagedMqttClient, IDisposable
+    public class ManagedMqttClient : IManagedMqttClient
     {
         private readonly BlockingCollection<MqttApplicationMessage> _messageQueue = new BlockingCollection<MqttApplicationMessage>();
         private readonly Dictionary<string, MqttQualityOfServiceLevel> _subscriptions = new Dictionary<string, MqttQualityOfServiceLevel>();