Update lib submodule

diff --git a/rpp-lib b/rpp-lib
index 8a2657a15be4033871c2498f94ee483ef0c3f957..573021795371f41a23ed0fe0b5171f38bb96d86e 160000 (submodule)
--- a/rpp-lib
+++ b/rpp-lib
@@ -1 +1 @@
-Subproject commit 8a2657a15be4033871c2498f94ee483ef0c3f957
+Subproject commit 573021795371f41a23ed0fe0b5171f38bb96d86e