v0.6.0
v0.6.0

Added rudimentary test bench in python for modbus testing
Added support for permissions and dbus types for writing
Added function code 4 (Read input register), 6 (write register) and 16
(writes multiple registers)
Made error messages more verbose
Minor fixes

victronenergy/dbus_modbustcp,victronenergy/dbus_modbustcp,victronenergy/dbus_modbustcp,victronenergy/dbus_modbustcp