How to use
----------

* Install Python 3.6 or newer.
* Install pdfminer.six.

  `pip install pdfminer.six`

* (Optionally) install extra dependencies for extracting images.

  `pip install 'pdfminer.six[image]'`

* Install pytesseract.

  `sudo apt install tesseract-ocr`

* Install poppler.

  `sudo apt install poppler-utils`