updated README on chart tools
updated README on chart tools

zuoshifan/emacs.d,zuoshifan/emacs.d,zuoshifan/emacs.d,zuoshifan/emacs.d,zuoshifan/emacs.d,zuoshifan/emacs.d,YangXin/emacs.d,zuoshifan/emacs.d,zuoshifan/emacs.d,YangXin/emacs.d,zuoshifan/emacs.d