Update MQTTnet.nuspec

Build/MQTTnet.nuspec

@@ -12,11 +12,9 @@
     <requireLicenseAcceptance>true</requireLicenseAcceptance>
     <description>MQTTnet is a high performance .NET library for MQTT based communication. It provides a MQTT client and a MQTT server (broker) and supports v3.1.0, v3.1.1 and v5.0.0 of the MQTT protocol.</description>
     <releaseNotes>
-* [Core] Removed IDisposable from MqttClientConnection.cs (#1284).
-* [Core] Improved message of timeout exception (#1302, thanks to @patagonaa).
-* [RpcClient] Filling response topic when using MQTTv5. (#1295, thanks to @MD-V).
-* [Server] Fixed 'SessionIsPresent' handling for MQTTv5 (#1300, thanks to @logicaloud).
-* [Server] Improved session management for MQTTv5 (#1294, thanks to @logicaloud).
+* [Core] Decreased object allocations (#1324, thanks to @gfoidl).
+* [Client] Fixed issue in _MqttApplicationMessageBuilder.WithPayload_ (#1322, thanks to @gfoidl).
+
 Git commit: $gitCommit
     </releaseNotes>
     <copyright>Copyright Christian Kratky 2016-2021</copyright>