Show stderr output when running convert-grammars
Show stderr output when running convert-grammars

This will let us see why it's failing.

a0viedo/linguist,ppaulweber/github-linguist,sebgod/linguist,cokeboL/linguist,cybernet14/linguist,sagar290/linguist,MostAwesomeDude/linguist,SRI-CSL/linguist,mwpastore/linguist,PsichiX/linguist,phpsgi/linguist,mwpastore/linguist,JJ/linguist,a0viedo/linguist,MahmoudFayed/linguist,marcojonker/test,nburkley/linguist,sideci-sample/sideci-sample-linguist,hcutler/linguist,sideci-sample/sideci-sample-linguist,mattn/linguist,yyx990803/linguist,hcutler/linguist,assimovt/ling-ist,bluebear94/linguist,mcandre/linguist,matt40k/linguist,whitj00/linguist,alvarotrigo/linguist,yyx990803/linguist,chiranjeevjain/linguist,bluebear94/linguist,christop/linguist,erkyrath/linguist,pchaigno/linguist,BerkeleyTrue/linguist,alitalia/linguist,FStarLang/linguist,pcantrell/linguist,Rockyspade/linguist,alvarotrigo/linguist,anhongyue/test222,c-lipka/linguist,pcantrell/linguist,erkyrath/linguist,R4PaSs/linguist,chiranjeevjain/linguist,yscho/linguist,manveru/linguist,MadcapJake/linguist,github/linguist,thejameskyle/linguist,jrnold/linguist,kyoungrok0517/linguist,Rockyspade/linguist,CoderXpert/linguist,PsichiX/linguist,pchaigno/linguist,yscho/linguist,kr/linguist,martynbm/linguist,yyx990803/linguist,osorgin/linguist,sebgod/linguist,erkyrath/linguist,matt40k/linguist,iblech/linguist,davidzchen/linguist,ilyes14/linguist,stanhu/linguist,yyx990803/linguist,ammaraskar/linguist,davidzchen/linguist,SRI-CSL/linguist,Mx7f/linguist,kyoungrok0517/linguist,sebgod/linguist,meunierfrederic/octocatlinguist,alitalia/linguist,MostAwesomeDude/linguist,hcatlin/linguist,ya7lelkom/linguist,steventhanna/linguist,adamkaplan/linguist,anhongyue/test222,pchaigno/linguist,JJ/linguist,MahmoudFayed/linguist,stanhu/linguist,JJ/linguist,seanders/linguist,tschf/linguist,MadcapJake/linguist,georgesuperman/linguist,meunierfrederic/octocatlinguist,BerkeleyTrue/linguist,jrnold/linguist,cokeboL/linguist,jtbandes/linguist,ilyes14/linguist,marcojonker/test,CoderXpert/linguist,seanders/linguist,stanhu/linguist,thejameskyle/linguist,jjatria/linguist,sebgod/linguist,phpsgi/linguist,jtbandes/linguist,stanhu/linguist,JJ/linguist,c-lipka/linguist,hcatlin/linguist,CegepVictoriaville/linguist,ppaulweber/github-linguist,pchaigno/linguist,Mx7f/linguist,douglas-larocca/linguist,martynbm/linguist,mcandre/linguist,christop/linguist,github/linguist,jjatria/linguist,scttnlsn/linguist,assimovt/ling-ist,tschf/linguist,erkyrath/linguist,FStarLang/linguist,github/linguist,iblech/linguist,ya7lelkom/linguist,whitj00/linguist,R4PaSs/linguist,nburkley/linguist,kr/linguist,georgesuperman/linguist,scttnlsn/linguist,adamkaplan/linguist,mattn/linguist,github/linguist,douglas-larocca/linguist,CegepVictoriaville/linguist,steventhanna/linguist,osorgin/linguist,cybernet14/linguist,ammaraskar/linguist,manveru/linguist,meunierfrederic/octocatlinguist,sagar290/linguist