Update nuspec

Build/MQTTnet.AspNetCore.nuspec

@@ -15,7 +15,7 @@
     <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>
     <dependencies>
-      <dependency id="MQTTnet" version="2.8.0" />
+      <dependency id="MQTTnet" version="2.8.0-rc2" />
     </dependencies>
   </metadata>
 

Build/MQTTnet.Extensions.ManagedClient.nuspec

@@ -15,7 +15,7 @@
     <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> 
     <dependencies>
-      <dependency id="MQTTnet" version="2.8.0" />
+      <dependency id="MQTTnet" version="2.8.0-rc2" />
     </dependencies>
   </metadata>
 

Build/MQTTnet.Extensions.Rpc.nuspec

@@ -15,7 +15,7 @@
     <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> 
     <dependencies>
-      <dependency id="MQTTnet" version="2.8.0" />
+      <dependency id="MQTTnet" version="2.8.0-rc2" />
     </dependencies>
   </metadata>