Add Mathematica test file extension: .mt
Add Mathematica test file extension: .mt

erkyrath/linguist,stanhu/linguist,sebgod/linguist,ppaulweber/github-linguist,jrnold/linguist,MostAwesomeDude/linguist,pchaigno/linguist,stanhu/linguist,yyx990803/linguist,yyx990803/linguist,erkyrath/linguist,pchaigno/linguist,github/linguist,meunierfrederic/octocatlinguist,github/linguist,stanhu/linguist,meunierfrederic/octocatlinguist,sebgod/linguist,PsichiX/linguist,jtbandes/linguist,pchaigno/linguist,pchaigno/linguist,sebgod/linguist,erkyrath/linguist,yyx990803/linguist,JJ/linguist,jtbandes/linguist,steventhanna/linguist,JJ/linguist,osorgin/linguist,PsichiX/linguist,christop/linguist,R4PaSs/linguist,MahmoudFayed/linguist,jrnold/linguist,steventhanna/linguist,JJ/linguist,stanhu/linguist,github/linguist,c-lipka/linguist,mwpastore/linguist,tschf/linguist,erkyrath/linguist,c-lipka/linguist,meunierfrederic/octocatlinguist,yyx990803/linguist,MahmoudFayed/linguist,tschf/linguist,ppaulweber/github-linguist,github/linguist,mwpastore/linguist,JJ/linguist,MostAwesomeDude/linguist,sebgod/linguist,R4PaSs/linguist,christop/linguist,osorgin/linguist