Style fixes suggested by pylint.

fedireads/models/book.py

@@ -1,8 +1,9 @@
 ''' database schema for books and shelves '''
+from uuid import uuid4
+
 from django.utils import timezone
 from django.db import models
 from model_utils.managers import InheritanceManager
-from uuid import uuid4
 
 from fedireads.settings import DOMAIN
 from fedireads.utils.fields import JSONField, ArrayField
@@ -155,4 +156,3 @@ class Author(FedireadsModel):
         models.CharField(max_length=255), blank=True, default=list
     )
     bio = models.TextField(null=True, blank=True)
-