add django-model-utils version, fix typo & quality

VEDA_OS01/models.py

@@ -446,9 +446,10 @@ class TranscriptionProviderType(object):
 
 class TranscriptionPreferences(TimeStampedModel):
     """
-    Model to contain third party transcription service provider preferance.
+    Model to contain third party transcription service provider preferances.
     """
-    org = models.CharField('Organization',
+    org = models.CharField(
+        'Organization',
         max_length=50,
         help_text='This value must match the value of organization in studio/edx-platform.'
     )

requirements.txt

@@ -4,7 +4,7 @@ djangorestframework
 django-cors-headers
 django-oauth-toolkit==0.11.0
 django-filter
-django-model-utils
+django-model-utils==3.0.0
 newrelic
 uwsgi
 pysftp