bump version to 0.18.0
bump version to 0.18.0

(not yet release time)

rosenpin/Gadgetbridge,roidelapluie/Gadgetbridge,Freeyourgadget/Gadgetbridge,Freeyourgadget/Gadgetbridge,roidelapluie/Gadgetbridge,Freeyourgadget/Gadgetbridge,roidelapluie/Gadgetbridge,Freeyourgadget/Gadgetbridge,rosenpin/Gadgetbridge,rosenpin/Gadgetbridge