Recognise R comments in heuristic.
Recognise R comments in heuristic.

sebgod/linguist,erkyrath/linguist,MahmoudFayed/linguist,yyx990803/linguist,JJ/linguist,sebgod/linguist,tschf/linguist,pchaigno/linguist,stanhu/linguist,MahmoudFayed/linguist,github/linguist,github/linguist,pchaigno/linguist,yyx990803/linguist,mwpastore/linguist,yyx990803/linguist,osorgin/linguist,JJ/linguist,pchaigno/linguist,yyx990803/linguist,stanhu/linguist,ppaulweber/github-linguist,jtbandes/linguist,erkyrath/linguist,JJ/linguist,R4PaSs/linguist,tschf/linguist,christop/linguist,JJ/linguist,mwpastore/linguist,pchaigno/linguist,github/linguist,sebgod/linguist,erkyrath/linguist,R4PaSs/linguist,sebgod/linguist,erkyrath/linguist,ppaulweber/github-linguist,stanhu/linguist,christop/linguist,osorgin/linguist,jtbandes/linguist,github/linguist,stanhu/linguist