Remove outdated workaround for OrderedDict

collections.OrderedDict is available on all supported Pythons

tests/core/tests/test_resources.py

@@ -1,6 +1,7 @@
 from __future__ import unicode_literals
 
 import tablib
+from collections import OrderedDict
 from copy import deepcopy
 from datetime import date
 from decimal import Decimal
@@ -24,11 +25,6 @@ from ..models import (
     WithFloatField, Person, Role
 )
 
-try:
-    from collections import OrderedDict
-except ImportError:
-    from django.utils.datastructures import SortedDict as OrderedDict
-
 try:
     from django.utils.encoding import force_text
 except ImportError: