fix: add line feed

Author: booxood

src/gitalk.jsx

@@ -296,6 +296,7 @@ class GitalkComponent extends Component {
  replyCommentArray.unshift(`@${replyComment.user.login}`)
  replyCommentArray = replyCommentArray.map(t => `> ${t}`)
  replyCommentArray.push('')
+ replyCommentArray.push('')
  if (comment) replyCommentArray.unshift('')
  this.setState({comment: comment + replyCommentArray.join('\n')}, () => {
  autosize.update(this.commentEL)