new_contents: # -*- coding: utf-8 -*-
  from __future__ import unicode_literals
  
  from django.db import models, migrations
  import djangocms_blog.models
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('djangocms_blog', '0013_auto_20151207_1027'),
      ]
  
      operations = [
          migrations.AlterField(
              model_name='blogcategorytranslation',
              name='slug',
              field=djangocms_blog.models.UnuniqueSlugField(verbose_name='Slug', blank=True),
              preserve_default=True,
          ),
      ]
  
subject: add new migration file