title: Django 1.9 CharField length modifications are not applied
body: <p>I'm using django 1.9 and the admin site for cataloging. 
  I changed this in my models.py:</p>
  
  <pre><code>localidad = models.CharField(max_length=30, verbose_name='Localidad')
  </code></pre>
  
  <p>for this:</p>
  
  <pre><code>localidad = models.CharField(max_length=300, verbose_name='Localidad')
  </code></pre>
  
  <p>I saved models.py and made manage.py makemigrations and migrate but changes are not reflected, an error shows up saying the field has 30 character max.
  Any help  any help would be appreciated</p>