Tweak gitignore
diff --git a/.gitignore b/.gitignore
index ad272e6..5fdec72 100644
--- a/.gitignore
+++ b/.gitignore
@@ -32,3 +32,6 @@
 # Protobuf output files
 voltha/core/protos/*.desc
 voltha/core/protos/*_pb2.py
+
+# Editors
+*.bak