* Add migration Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> * Add comments Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> * cargo update -p sp-io Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> * cargo update -p sp-io Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> * cargo update -p sp-io Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>