sort downloads directory by time

[Docbroke]

example code

	## sort by time in downloads dirs
    IFS=$'\n' 
	if [[ $PWD == ~/Downloads* ]]; then
		dirs=($(stat -c '%Y=%n' "${dirs[@]}" | sort -nr | cut -d '=' -f2))
		files=($(stat -c '%Y=%n' "${files[@]}" | sort -nr | cut -d '=' -f2))
	fi
    unset IFS
    
    list=("${dirs[@]}" "${files[@]}")

pull request https://github.com/dylanaraps/fff/pull/184