Add CDNJS version badge in README.md (#6297)
Add CDNJS version badge in README.md (#6297)

This will add the badge to show its version on CDNJS and also link to its page on CDNJS!
caoruiy/bootstrap,looker/bootstrap,byronigoe/bootstrap,Kpler/bootstrap,icfantv/bootstrap,Kpler/bootstrap,Servoy/bootstrap,angular-ui/bootstrap,BookingBug/bootstrap,BookingBug/bootstrap,Servoy/bootstrap,angular-ui/bootstrap,fpipita/bootstrap,looker/bootstrap,icfantv/bootstrap,caoruiy/bootstrap,byronigoe/bootstrap,fpipita/bootstrap