Update readme.
Update readme.

yieme/hexo-theme-freewill,blackshow/hexo-theme-freemind.386,wzpan/hexo-theme-freemind,oomusou/hexo-theme-openmind,leesei/hexo-theme-freemind,wzpan/hexo-theme-freemind,chenzaichun/hexo-theme-freemind,JoshuaZe/freemind,zhi1ong/hexo-theme-freemind,leesei/hexo-theme-freemind