Switch to a better F# grammar
Switch to a better F# grammar

This fixes many bugs with F# highlighting, and the grammar is being
actively developed and maintained by the fsharp organization on GitHub.

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