Update documents

Build/MQTTnet.nuspec

@@ -13,9 +13,13 @@
     <releaseNotes>* [Client] Added support for web socket communication channel (thanks to nowakpiotr)
 * [Core] Huge performance optimizations (thanks to JanEggers)
 * [Client] Fixed an issue when calling _DisconnectAsync_ and the connection is already closed.
+* [Core] Added several new interfaces
+* [Core] Added a factory for creation of application messages
+* [Core] Fixed issues in connection handling
+* [Client] Fixed issues with subscribing/unsubscribing (breaking change!)
     </releaseNotes>
     <copyright>Copyright Christian Kratky 2016-2017</copyright>
-    <tags>MQTT MQTTClient MQTTServer MQTTBroker Broker NETStandard IoT InternetOfThings Messaging Queue Hardware Arduino</tags> 
+    <tags>MQTT Message Queue Telemetry Transport MQTTClient MQTTServer Server MQTTBroker Broker NETStandard IoT InternetOfThings Messaging Hardware Arduino Sensor Actuator M2M</tags> 
     <dependencies>
 
       <group targetFramework="netstandard1.3">
@@ -24,7 +28,7 @@
       </group>
       
       <group targetFramework="uap10.0">
-        <dependency id="Microsoft.NETCore.UniversalWindowsPlatform" version="5.3.3" />
+        <dependency id="Microsoft.NETCore.UniversalWindowsPlatform" version="5.4.0" />
       </group>
 
     </dependencies>

README.md

@@ -80,14 +80,12 @@ client.ApplicationMessageReceived += (s, e) =>
 
 client.Connected += async (s, e) =>
 {
-    Console.WriteLine("### CONNECTED WITH SERVER ###");
+    Console.WriteLine("### CONNECTED WITH SERVER, SUBSCRIBING ###");
 
     await client.SubscribeAsync(new List<TopicFilter>
     {
         new TopicFilter("#", MqttQualityOfServiceLevel.AtMostOnce)
     });
-
-    Console.WriteLine("### SUBSCRIBED ###");
 };
 
 client.Disconnected += async (s, e) => 
@@ -116,17 +114,12 @@ catch
 
 Console.WriteLine("### WAITING FOR APPLICATION MESSAGES ###");
 
+var messageFactory = new MqttApplicationMessageFactory();
 while (true)
 {
     Console.ReadLine();
 
-    var applicationMessage = new MqttApplicationMessage(
-        "A/B/C",
-        Encoding.UTF8.GetBytes("Hello World"),
-        MqttQualityOfServiceLevel.AtLeastOnce,
-        false
-    );
-
+    var applicationMessage = messageFactory.CreateApplicationMessage("myTopic", "Hello World", MqttQualityOfServiceLevel.AtLeastOnce);
     await client.PublishAsync(applicationMessage);
 }
 ```