Add a "VibeDefaultMain" version to the package description of "dub init xx vibe.d".
Add a "VibeDefaultMain" version to the package description of "dub init xx vibe.d".

This will allow to invert the current VibeCustomMain version at some point to make vibe.d play nicer as a simple library.

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