[install] Fall back to wget if curl failed
[install] Fall back to wget if curl failed

Close #605

janlazo/fzf,tomfitzhenry/pkg-fzf,wilywampa/fzf,janlazo/fzf,wilywampa/fzf,janlazo/fzf,tomfitzhenry/pkg-fzf,lululau/fzf,qiemem/fzf,infokiller/fzf,qiemem/fzf,wilywampa/fzf,tomfitzhenry/pkg-fzf,junegunn/fzf,infokiller/fzf,lululau/fzf,stuha/wbr-zsh,junegunn/fzf,infokiller/fzf,junegunn/fzf,qiemem/fzf,lululau/fzf