Update optional vibe-d dependency version. See #727.
Update optional vibe-d dependency version. See #727.

jelmansouri/dub,grogancolin/dub,D-Programming-Language/dub,xentec/dub,Geod24/dub,jeanbaptistelab/dub,p0nce/dub,Flamaros/dub,gedaiu/dub,rjframe/dub