append a newline when writing dub.selections.json
append a newline when writing dub.selections.json

D-Programming-Language/dub,jelmansouri/dub,rjframe/dub,dreamsxin/dub,xentec/dub,alexeibs/dub,Abscissa/dub,schuetzm/dub,y12uc231/dub,Geod24/dub,jeanbaptistelab/dub,gedaiu/dub,Abscissa/dub-data-mod,p0nce/dub,nazriel/dub,grogancolin/dub,Flamaros/dub