Bump version to v0.4.1

Signed-off-by: Jess Frazelle <acidburn@microsoft.com>
diff --git a/VERSION.txt b/VERSION.txt
index fb7a04c..5aff472 100644
--- a/VERSION.txt
+++ b/VERSION.txt
@@ -1 +1 @@
-v0.4.0
+v0.4.1