update readme about issues/jsx
update readme about issues/jsx

hzoo/babel,hzoo/babel,jridgewell/babel,kaicataldo/babel,babel/babel,jridgewell/babel,kaicataldo/babel,hzoo/babel,jridgewell/babel,kaicataldo/babel,babel/babel,hzoo/babel,babel/babel,jridgewell/babel,kaicataldo/babel,babel/babel