Merge proces, enable signing of the assembly.

Frameworks/MQTTnet.NetStandard/Packets/MqttUnsubAckPacket.cs

@@ -0,0 +1,12 @@
+namespace MQTTnet.Packets
+{
+    public sealed class MqttUnsubAckPacket : MqttBasePacket, IMqttPacketWithIdentifier
+    {
+        public ushort PacketIdentifier { get; set; }
+
+        public override string ToString()
+        {
+            return "UnsubAck: [PacketIdentifier=" + PacketIdentifier + "]";
+        }
+    }
+}