code: func (c *Cleaner) cleanBr(doc *goquery.Document) *goquery.Document {
  	linebreaks := doc.Find("br")
  	linebreaks.Each(func(i int, br *goquery.Selection) {
  		node := br.Get(0)
  		node.Data = "\n\n"
  		node.Type = html.TextNode
  		node.Attr = []html.Attribute{}
  		node.DataAtom = 0
  		node.FirstChild = nil
  		node.LastChild = nil
  	})
  	return doc
  }
docs: // replace <br /> with \n\n