Update README.md

README.md

@@ -110,7 +110,7 @@ If you use this library and want to see your project here please create a pull r
 
 MIT License
 
-MQTTnet Copyright (c) 2016-2019 Christian Kratky
+MQTTnet Copyright (c) 2016-2020 Christian Kratky
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal