Add `warn` message indicating deprecation
Add `warn` message indicating deprecation

hcatlin/linguist,erkyrath/linguist,seanders/linguist,meunierfrederic/octocatlinguist,davidzchen/linguist,jtbandes/linguist,christop/linguist,jrnold/linguist,FStarLang/linguist,MahmoudFayed/linguist,mwpastore/linguist,MostAwesomeDude/linguist,thejameskyle/linguist,anhongyue/test222,adamkaplan/linguist,douglas-larocca/linguist,martynbm/linguist,c-lipka/linguist,github/linguist,hcatlin/linguist,martynbm/linguist,christop/linguist,anhongyue/test222,pcantrell/linguist,chiranjeevjain/linguist,c-lipka/linguist,ppaulweber/github-linguist,Rockyspade/linguist,bluebear94/linguist,a0viedo/linguist,cokeboL/linguist,matt40k/linguist,thejameskyle/linguist,assimovt/ling-ist,marcojonker/test,JJ/linguist,0a-/linguist,jjatria/linguist,pchaigno/linguist,JJ/linguist,ammaraskar/linguist,cybernet14/linguist,marcojonker/test,SRI-CSL/linguist,scttnlsn/linguist,ammaraskar/linguist,sagar290/linguist,mcandre/linguist,CoderXpert/linguist,stanhu/linguist,iblech/linguist,ya7lelkom/linguist,stanhu/linguist,georgesuperman/linguist,CoderXpert/linguist,yyx990803/linguist,erkyrath/linguist,seanders/linguist,wcandillon/linguist,github/linguist,pcantrell/linguist,mwpastore/linguist,phpsgi/linguist,steventhanna/linguist,phpsgi/linguist,github/linguist,meunierfrederic/octocatlinguist,MostAwesomeDude/linguist,mcandre/linguist,yscho/linguist,hcutler/linguist,R4PaSs/linguist,steventhanna/linguist,pchaigno/linguist,JJ/linguist,FStarLang/linguist,sagar290/linguist,sebgod/linguist,iblech/linguist,Mx7f/linguist,whitj00/linguist,PsichiX/linguist,github/linguist,CegepVictoriaville/linguist,tschf/linguist,meunierfrederic/octocatlinguist,pchaigno/linguist,BerkeleyTrue/linguist,ya7lelkom/linguist,cokeboL/linguist,PsichiX/linguist,matt40k/linguist,jrnold/linguist,SRI-CSL/linguist,hcutler/linguist,alvarotrigo/linguist,MadcapJake/linguist,manveru/linguist,ilyes14/linguist,alitalia/linguist,MadcapJake/linguist,bluebear94/linguist,nburkley/linguist,yyx990803/linguist,sebgod/linguist,sideci-sample/sideci-sample-linguist,chiranjeevjain/linguist,sebgod/linguist,CegepVictoriaville/linguist,yyx990803/linguist,osorgin/linguist,kyoungrok0517/linguist,jtbandes/linguist,MahmoudFayed/linguist,kyoungrok0517/linguist,erkyrath/linguist,whitj00/linguist,BerkeleyTrue/linguist,manveru/linguist,mattn/linguist,adamkaplan/linguist,Rockyspade/linguist,jjatria/linguist,davidzchen/linguist,sideci-sample/sideci-sample-linguist,stanhu/linguist,R4PaSs/linguist,stanhu/linguist,cybernet14/linguist,erkyrath/linguist,a0viedo/linguist,sebgod/linguist,douglas-larocca/linguist,Mx7f/linguist,kr/linguist,alvarotrigo/linguist,kr/linguist,ppaulweber/github-linguist,0a-/linguist,alitalia/linguist,pchaigno/linguist,wcandillon/linguist,yscho/linguist,nburkley/linguist,osorgin/linguist,yyx990803/linguist,JJ/linguist,tschf/linguist,georgesuperman/linguist,scttnlsn/linguist,mattn/linguist,ilyes14/linguist,assimovt/ling-ist