message: Update generator README
diff: @@ -9,8 +9,9 @@ structure based on the `csv` subfolder data files.
  ## Requirements
  -* Python interpreter version 2 or 3.
  +* Python interpreter 3.
  * Jinja2 template engine.
  +* pandas data analysis library
  * CSV files can be modified with any text editor or (at your option) any
  spreadsheet editor.
  