title: Why is tesseract not accepting the config?
body: <p>Im trying to get tesseract to only recognize numbers but no matter what I put for configuration, it ignores it. pytessseract is in version 0.2.0 and tesseract in 4.00.00alpha</p>
  
  <pre><code>from PIL import Image
  
  import pytesseract as tes
  import glob
  
  tes.pytesseract.tesseract_cmd = 'C:/Program Files (x86)/Tesseract-OCR/tesseract'
  
  a = glob.glob(r'C:\Users\Pascal\Desktop\visible\*.png')
  
  for imgPath in a:
      casd = Image.open(imgPath).convert('L').point(lambda x: 0 if x &lt; 200 else 255, '1')
      im = tes.image_to_string(casd, config='outputbase digits')
      print(im)
  </code></pre>
  
  <p>Some outputs: </p>
  
  <p>® a 69 ® 0</p>
  
  <p>® a 69 ® 0</p>
  
  <p>® ase ® 0</p>
  
  <p>® aso ® 0</p>