Fixed "indentation is not a multiple of four" pep8 issues.

tests/m2m_multiple/models.py

@@ -14,21 +14,23 @@ from django.utils.encoding import python_2_unicode_compatible
 @python_2_unicode_compatible
 class Category(models.Model):
     name = models.CharField(max_length=20)
+
     class Meta:
-       ordering = ('name',)
+        ordering = ('name',)
 
     def __str__(self):
         return self.name
 
+
 @python_2_unicode_compatible
 class Article(models.Model):
     headline = models.CharField(max_length=50)
     pub_date = models.DateTimeField()
     primary_categories = models.ManyToManyField(Category, related_name='primary_article_set')
     secondary_categories = models.ManyToManyField(Category, related_name='secondary_article_set')
+
     class Meta:
-       ordering = ('pub_date',)
+        ordering = ('pub_date',)
 
     def __str__(self):
         return self.headline
-