Merge proces, enable signing of the assembly.

Frameworks/MQTTnet.NetStandard/Exceptions/MqttProtocolViolationException.cs

@@ -0,0 +1,12 @@
+using System;
+
+namespace MQTTnet.Exceptions
+{
+    public sealed class MqttProtocolViolationException : Exception
+    {
+        public MqttProtocolViolationException(string message)
+            : base(message)
+        {
+        }
+    }
+}