Merge pull request #229 from Achimh3011/bug/228

Move import of ABCs from collections to collections.abc

Author: sigmavirus24

AUTHORS.rst

@@ -47,3 +47,6 @@ Patches and Suggestions
 - Yorgos Pagles <yorgos@pagles.org>
 
 - Thomas Hauk <thauk@copperleaf.com>
+
+- Achim Herwig <python@wodca.de>
+

requests_toolbelt/_compat.py

@@ -8,7 +8,6 @@
     This module is private. If you use it, and something breaks, you were
     warned
 """
-from collections import Mapping, MutableMapping
 import sys
 
 import requests
@@ -53,9 +52,11 @@
 PY3 = sys.version_info > (3, 0)
 
 if PY3:
+    from collections.abc import Mapping, MutableMapping
     import queue
     from urllib.parse import urlencode, urljoin
 else:
+    from collections import Mapping, MutableMapping
     import Queue as queue
     from urllib import urlencode
     from urlparse import urljoin