update copyright year for 2020

MSVC/unistd.h

README

bin/dbus/dbus_cpp.h

bin/dbus/dbuscallmanager.cpp

bin/dbus/dbuscallmanager.h

bin/dbus/dbusclient.cpp

bin/dbus/dbusclient.h

bin/dbus/dbusconfigurationmanager.cpp

bin/dbus/dbusconfigurationmanager.h

bin/dbus/dbusinstance.cpp

bin/dbus/dbusinstance.h

bin/dbus/dbuspresencemanager.cpp

bin/dbus/dbuspresencemanager.h

bin/dbus/dbusvideomanager.cpp

bin/dbus/dbusvideomanager.h

bin/jni/JavaJNI2CJNI_Load.py

bin/jni/callmanager.i

bin/jni/configurationmanager.i

bin/jni/datatransfer.i

bin/jni/jni_interface.i