Add contributor at the beginning of the edited file

src/peerconnection.cpp

@@ -1,5 +1,6 @@
 /**
  * Copyright (c) 2019 Paul-Louis Ageneau
+ * Copyright (c) 2020 Filip Klembara (in2core)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public