Our house has a thin crack in rendering - see photo. Our neighbouring houses have similar and one neighbour, who is a builder and who has lived in house for over 20 years, says to just fill as tend to reappear. Had a couple of plasterer out - one says he'd rake out either side, bond and then fill/skim; the other says would use newish tape which is flexible and then skim. Not sure what to do. Any advice?