code: func (j *JSONLineParser) ParseLine(line string) (map[string]interface{}, error) {
  	parsed := make(map[string]interface{})
  	err := json.Unmarshal([]byte(line), &parsed)
  	return parsed, err
  }
docs: // ParseLine will unmarshal the thing it read in to detect errors in the JSON
  // (by failing to parse) and give us an object that can be mutated by the
  // various filters honeytail might apply.