Use correct version of babel-preset-es2015
Use correct version of babel-preset-es2015

The 7.x-alpha preset won't work with 6.x core.

An alternative would be to bump babel-cli to 7.x-alpha (if you'd like to help us test :D)
hebbet/bootstrap,peterblazejewicz/bootstrap,yuyokk/bootstrap,Delagen/bootstrap,yuyokk/bootstrap,igoynawamreh/bootstrap,igoynawamreh/bootstrap,lemuelbarango/bootstrap,andresgalante/bootstrap,fschumann1211/bootstrap,afuno/bootstrap,SweetProcess/bootstrap,davethegr8/bootstrap,supergibbs/bootstrap,seanwu99/bootstrap,nice-fungal/bootstrap,tibo66/bootstrap,gijsbotje/bootstrap,janseliger/bootstrap,kvlsrg/bootstrap,tagliala/bootstrap,NCARB/bootstrap,NCARB/bootstrap,TheFridayInstitute/bootstrap,bardiharborow/bootstrap,fschumann1211/bootstrap,Delagen/bootstrap,gijsbotje/bootstrap,lemuelbarango/bootstrap,joblocal/bootstrap,joblocal/bootstrap,Hemphill/bootstrap-docs,janseliger/bootstrap,stanwmusic/bootstrap,zalog/bootstrap,jipexu/bootstrap,johnajacob/bootstrap,lemuelbarango/bootstrap,Lyricalz/bootstrap,m5o/bootstrap,TheFridayInstitute/bootstrap,realcrowd/bootstrap,tibo66/bootstrap,janseliger/bootstrap,twbs/bootstrap,lipis/bootstrap,kvlsrg/bootstrap,zalog/bootstrap,inway/bootstrap,realcrowd/bootstrap,coliff/bootstrap,9-chirno/chirno,bardiharborow/bootstrap,SweetProcess/bootstrap,bardiharborow/bootstrap,vsn4ik/bootstrap,vsn4ik/bootstrap,bardiharborow/bootstrap,Lyricalz/bootstrap,igoynawamreh/bootstrap,stanwmusic/bootstrap,Lyricalz/bootstrap,lipis/bootstrap,fschumann1211/bootstrap,xt0rted/bootstrap,gijsbotje/bootstrap,creativewebjp/bootstrap,yuyokk/bootstrap,vsn4ik/bootstrap,jipexu/bootstrap,hebbet/bootstrap,xt0rted/bootstrap,9-chirno/chirno,johnajacob/bootstrap,hebbet/bootstrap,nice-fungal/bootstrap,9-chirno/chirno,inway/bootstrap,xt0rted/bootstrap,afuno/bootstrap,tibo66/bootstrap,tagliala/bootstrap,creativewebjp/bootstrap,supergibbs/bootstrap,davethegr8/bootstrap,coliff/bootstrap,TheFridayInstitute/bootstrap,GerHobbelt/bootstrap,Hemphill/bootstrap-docs,davethegr8/bootstrap,johnajacob/bootstrap,davethegr8/bootstrap,tjkohli/bootstrap,andresgalante/bootstrap,twbs/bootstrap,jipexu/bootstrap,Delagen/bootstrap,tjkohli/bootstrap,TheFridayInstitute/bootstrap,johnajacob/bootstrap,bootstrapbrasil/bootstrap,xt0rted/bootstrap,andresgalante/bootstrap,peterblazejewicz/bootstrap,Delagen/bootstrap,stanwmusic/bootstrap,GerHobbelt/bootstrap,inway/bootstrap,bootstrapbrasil/bootstrap,SweetProcess/bootstrap,supergibbs/bootstrap,lipis/bootstrap,realcrowd/bootstrap,kvlsrg/bootstrap,lemuelbarango/bootstrap,Hemphill/bootstrap-docs,zalog/bootstrap,gijsbotje/bootstrap,Lyricalz/bootstrap,realcrowd/bootstrap,GerHobbelt/bootstrap,supergibbs/bootstrap,hebbet/bootstrap,joblocal/bootstrap,seanwu99/bootstrap,stanwmusic/bootstrap,afuno/bootstrap,tibo66/bootstrap,vsn4ik/bootstrap,m5o/bootstrap,andresgalante/bootstrap,tagliala/bootstrap,igoynawamreh/bootstrap,janseliger/bootstrap,seanwu99/bootstrap,nice-fungal/bootstrap,SweetProcess/bootstrap,joblocal/bootstrap,seanwu99/bootstrap,creativewebjp/bootstrap,lipis/bootstrap,afuno/bootstrap,9-chirno/chirno,yuyokk/bootstrap,fschumann1211/bootstrap,bootstrapbrasil/bootstrap,NCARB/bootstrap,jipexu/bootstrap,peterblazejewicz/bootstrap,creativewebjp/bootstrap,NCARB/bootstrap,Hemphill/bootstrap-docs