Merge "Import MutableMapping from the correct Python module"

migrate/changeset/databases/sqlite.py

@@ -4,7 +4,7 @@
    .. _`SQLite`: http://www.sqlite.org/
 """
 try:  # Python 3
-    from collections import MutableMapping as DictMixin
+    from collections.abc import MutableMapping as DictMixin
 except ImportError:  # Python 2
     from UserDict import DictMixin
 from copy import copy

migrate/changeset/schema.py

@@ -3,7 +3,7 @@
 """
 import abc
 try:  # Python 3
-    from collections import MutableMapping as DictMixin
+    from collections.abc import MutableMapping as DictMixin
 except ImportError:  # Python 2
     from UserDict import DictMixin
 import warnings