Update 'sweep' submodule

diff --git a/sweep b/sweep
index 8eac70fba4a37c3124fa0fe32d96f06c747a7469..15c5e75c969da3a30bf770c0b23eb274c6cba62c 160000 (submodule)
--- a/sweep
+++ b/sweep
@@ -1 +1 @@
-Subproject commit 8eac70fba4a37c3124fa0fe32d96f06c747a7469
+Subproject commit 15c5e75c969da3a30bf770c0b23eb274c6cba62c