Fix python warnings: Use collections.abc instead collectionsjjardon/warnings_collections

Since python 3.3, collections has been moved to collections.abc module.
For backwards compatibility, they continue to be visible in this module through Python 3.7.
Subsequently, they will be removed entirely.

See https://docs.python.org/3/library/collections.html

1 files changed, 1 insertions, 1 deletions

diff --git a/buildstream/_includes.py b/buildstream/_includes.py
index e30003630..df14c9f2d 100644
--- a/buildstream/_includes.py
+++ b/buildstream/_includes.py
@@ -1,5 +1,5 @@
 import os
-from collections import Mapping
+from collections.abc import Mapping
 from . import _yaml
 from ._exceptions import LoadError, LoadErrorReason