Add note for homebrew users.
Add note for homebrew users.

letouzey/coq-wip,JasonGross/coq,SkySkimmer/coq,JasonGross/coq,gares/coq,JasonGross/coq,maximedenes/coq,gares/coq,gares/coq,gares/coq,Matafou/coq,ejgallego/coq,letouzey/coq-wip,letouzey/coq-wip,maximedenes/coq,ppedrot/coq,gares/coq,coq/coq,ejgallego/coq,letouzey/coq-wip,silene/coq,Zimmi48/coq,silene/coq,ppedrot/coq,Zimmi48/coq,ppedrot/coq,SkySkimmer/coq,ppedrot/coq,ejgallego/coq,silene/coq,Matafou/coq,maximedenes/coq,Zimmi48/coq,Zimmi48/coq,coq/coq,coq/coq,SkySkimmer/coq,ppedrot/coq,maximedenes/coq,Matafou/coq,maximedenes/coq,letouzey/coq-wip,ejgallego/coq,JasonGross/coq,coq/coq,SkySkimmer/coq