title: No module named 'captcha.fields'
body: <p>Hi~I have got a ModuleNotFoundError saying "No module named 'captcha.fields'" when I run manage.py in my Django project. 
  <a href="https://i.stack.imgur.com/jVsI7.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/jVsI7.png" alt="enter image description here"></a></p>
  
  <p>I confirm that django-simple-captcha has been installed and successfully imported into my programme. But I check the captcha package and I haven't found any definition for captcha.fields.
  Could anyone help me, please? Thank you. </p>