remove more Python2 syntax

Author: a-detiste

shopify/api_version.py

@@ -9,7 +9,7 @@ class VersionNotFoundError(Exception):
     pass
 
 
-class ApiVersion(object):
+class ApiVersion:
     versions = {}
 
     @classmethod

shopify/collection.py

@@ -125,7 +125,7 @@ def __len__(self):
         return count + super(PaginatedCollection, self).__len__()
 
 
-class PaginatedIterator(object):
+class PaginatedIterator:
     """
     This class implements an iterator over paginated collections which aims to
     be more memory-efficient by not keeping more than one page in memory at a

shopify/limits.py

@@ -1,7 +1,7 @@
 import shopify
 
 
-class Limits(object):
+class Limits:
     """
     API Calls Limit
     https://help.shopify.com/en/api/getting-started/api-call-limit

shopify/mixins.py

@@ -1,15 +1,15 @@
 import shopify.resources
 
 
-class Countable(object):
+class Countable:
     @classmethod
     def count(cls, _options=None, **kwargs):
         if _options is None:
             _options = kwargs
         return int(cls.get("count", **_options))
 
 
-class Metafields(object):
+class Metafields:
     def metafields(self, _options=None, **kwargs):
         if _options is None:
             _options = kwargs
@@ -29,6 +29,6 @@ def add_metafield(self, metafield):
         return metafield
 
 
-class Events(object):
+class Events:
     def events(self):
         return shopify.resources.Event.find(resource=self.__class__.plural, resource_id=self.id)

shopify/session.py

@@ -19,7 +19,7 @@ class ValidationException(Exception):
     pass
 
 
-class Session(object):
+class Session:
     api_key = None
     secret = None
     protocol = "https"