Update README (replace backticks with $())
Update README (replace backticks with $())

As reported in #2, backticks on oh-my-zsh (with TERM=xterm*)
makes fzf run twice. This should be a bug of oh-my-zsh,
but for now using $() seems to be a quick workaround.

NgaNguyenDuy/fzf,wilywampa/fzf,mjwestcott/fzf,hyiltiz/fzf,me-and/fzf,lululau/fzf,alerque/fzf,infokiller/fzf,blueyed/fzf,d4ndo/fzf,bobpattersonjr/fzf,gregory-nisbet/fzf,me-and/fzf,alerque/fzf,junegunn/fzf,noscript/fzf,noscript/fzf,pokey/fzf,fazibear/fzf,hyiltiz/fzf,bobpattersonjr/fzf,NgaNguyenDuy/fzf,junegunn/fzf,blueyed/fzf,brosander/fzf,mhartington/fzf,me-and/fzf,noscript/fzf,tomfitzhenry/pkg-fzf,janlazo/fzf,janlazo/fzf,jebaum/fzf,brosander/fzf,pokey/fzf,stevenqzhang/fzf,mjwestcott/fzf,wilywampa/fzf,gregory-nisbet/fzf,qiemem/fzf,tomfitzhenry/pkg-fzf,janusnic/fzf,mhartington/fzf,infokiller/fzf,qiemem/fzf,hyiltiz/fzf,infokiller/fzf,hudak/fzf,janusnic/fzf,hudak/fzf,mjwestcott/fzf,fazibear/fzf,jebaum/fzf,stevenqzhang/fzf,stuha/wbr-zsh,jebaum/fzf,lululau/fzf,gregory-nisbet/fzf,lululau/fzf,stevenqzhang/fzf,pokey/fzf,blueyed/fzf,brosander/fzf,d4ndo/fzf,hudak/fzf,mhartington/fzf,qiemem/fzf,NgaNguyenDuy/fzf,fazibear/fzf,junegunn/fzf,janusnic/fzf,alerque/fzf,d4ndo/fzf,bobpattersonjr/fzf,tomfitzhenry/pkg-fzf,wilywampa/fzf,janlazo/fzf