docs: function streamInjectLrScript (opts) {
    opts = opts || {}
  
    assert.equal(typeof opts, 'object')
  
    const protocol = opts.protocol || 'http'
    const host = opts.host || 'localhost'
    const port = opts.port || 35729
  
    var lrTag = '<script type="text/javascript"'
    lrTag += 'src="'
    lrTag += protocol
    lrTag += '://'
    lrTag += host
    lrTag += ':'
    lrTag += port
    lrTag += '/livereload.js?snipver=1">'
    lrTag += '</script>'
  
    return hyperstream({ body: { _appendHtml: lrTag } })
  }