Update docs

Build/MQTTnet.nuspec

@@ -2,7 +2,7 @@
 <package >
   <metadata>
     <id>MQTTnet</id>
-    <version>2.7.5</version>
+    <version>2.8.0</version>
     <authors>Christian Kratky</authors>
     <owners>Christian Kratky</owners>
     <licenseUrl>https://github.com/chkr1011/MQTTnet/blob/master/LICENSE</licenseUrl>
@@ -10,13 +10,9 @@
     <iconUrl>https://raw.githubusercontent.com/chkr1011/MQTTnet/master/Images/Logo_128x128.png</iconUrl>
     <requireLicenseAcceptance>false</requireLicenseAcceptance>
     <description>MQTTnet is a high performance .NET library for MQTT based communication. It provides a MQTT client and a MQTT server (broker).</description>
-    <releaseNotes> * [Client] Fixed a deadlock while the client disconnects.
-* [Client] Fixed broken support for protocol version 3.1.0.
-* [Server] The _MqttTcpServerAdapter_ is now added to the ASP.NET services.
-* [Server] _MqttServerAdapter_ is renamed to _MqttTcpServerAdapter_ (BREAKING CHANGE!).
-* [Server] The server no longer sends the will message of a client if the disconnect was clean (via _Disconnect_ packet).
-* [Server] The application message interceptor now allows closing the connection.
-* [Server] Added a new flag for the _ClientDisconnected_ event which contains a value indicating whether the disconnect was clean (via _Disconnect_ packet).
+    <releaseNotes> * [Client] Received messages are now processed in the worker thread by default. Added a new setting for switching back to dedicated threads.
+* [Server] Added support for other WebSocket sub protocol formats like mqttv-3.1.1 (thanks to @israellot).
+* [Server] The takeover of an existing client sessions is now treated as a _clean_ disconnect of the previous client.
     </releaseNotes>
     <copyright>Copyright Christian Kratky 2016-2018</copyright>
     <tags>MQTT Message Queue Telemetry Transport MQTTClient MQTTServer Server MQTTBroker Broker NETStandard IoT InternetOfThings Messaging Hardware Arduino Sensor Actuator M2M ESP Smart Home Cities Automation Xamarin</tags>