title: No module named 'django.core.urlresolvers when using uni_form
body: <p>I am trying to use uni_form with Django 2.1.5 latest version.</p>
  
  <p>and after importing <code>from uni_form.helper import FormHelper</code> in the forms.py</p>
  
  <p>an error message says :</p>
  
  <blockquote>
    <p>File
    "D:\installed_apps\python\lib\site-packages\uni_form\helper.py", line
    1, in 
        from django.core.urlresolvers import reverse, NoReverseMatch ModuleNotFoundError: No module named 'django.core.urlresolvers'</p>
  </blockquote>
  
  <p>However, after looking arround in stackoverflow I came up with change the helper.py  :</p>
  
  <pre><code>from django.core.urlresolvers import reverse, NoReverseMatch
  </code></pre>
  
  <p>to :</p>
  
  <pre><code>from django.urls import reverse, NoReverseMatch
  </code></pre>
  
  <p>another problem rises :</p>
  
  <blockquote>
    <p>File
    "D:\installed_apps\python\lib\site-packages\uni_form\helper.py", line
    4, in 
        from utils import render_field ModuleNotFoundError: No module named 'utils'</p>
  </blockquote>