Revert "Remove useless object inheritance"

This reverts commit e256afc.

We are still support Python 2 and we want new-style classes there.

Author: oschwald

geoip2/database.py

@@ -16,7 +16,7 @@
 import geoip2.errors
 
 
-class Reader:
+class Reader(object):
     """GeoIP2 database Reader object.
 
     Instances of this class provide a reader for the GeoIP2 database format.

geoip2/mixins.py

@@ -3,7 +3,7 @@
 from abc import ABCMeta
 
 
-class SimpleEquality:
+class SimpleEquality(object):
     """Naive __dict__ equality mixin"""
 
     __metaclass__ = ABCMeta

geoip2/webservice.py

@@ -39,7 +39,7 @@
                      PermissionRequiredError)
 
 
-class Client:
+class Client(object):
     """Creates a new client object.
 
     It accepts the following required arguments: