Merge pull request marshmallow-code#1231 from marshmallow-code/docs_p…

…y3_no_object

Docs: Remove (object) from class definitions (useless in Python 3)

docs/nesting.rst

@@ -8,15 +8,15 @@ Schemas can be nested to represent relationships between objects (e.g. foreign k
 
     import datetime as dt
 
-    class User(object):
+    class User:
         def __init__(self, name, email):
             self.name = name
             self.email = email
             self.created_at = dt.datetime.now()
             self.friends = []
             self.employer = None
 
-    class Blog(object):
+    class Blog:
         def __init__(self, title, author):
             self.title = title
             self.author = author  # A User object

docs/quickstart.rst

@@ -14,7 +14,7 @@ Let's start with a basic user "model".
 
     import datetime as dt
 
-    class User(object):
+    class User:
         def __init__(self, name, email):
             self.name = name
             self.email = email