title: import error 'force_text' from 'django.utils.encoding'
body: <p>I'm implementing a graphql solution using python, graphene and django and I'm getting the following import error:</p>
  <pre><code>Result: Failure Exception: ImportError: cannot import name 'force_text' from 'django.utils.encoding'
  
  &quot;/home/site/wwwroot/.python_packages/lib/site-packages/graphene_django/utils/utils.py&quot;, line 6, in &lt;module&gt; from django.utils.encoding import force_text
  </code></pre>
  <p>I'm not sure about the versions and whether I need to import an additional module.
  My requirements.txt is like:</p>
  <pre><code>graphene&gt;=2.1,&lt;3
  graphene-django&gt;=2.1,&lt;3
  graphql-core&gt;=2.1,&lt;3
  graphql-relay==2.0.1
  django-filter&gt;=2
  </code></pre>
  <p>Has someone had a similar problem and can look at the versions that I use?
  Thanks</p>