Update rpp-lib to released version

diff --git a/rpp-lib b/rpp-lib
index a1162fdb1d1f4450a8d6d15e9faab1c826c79abd..b256e4425290b4d1220d8b173dd116e12041ccad 160000 (submodule)
--- a/rpp-lib
+++ b/rpp-lib
@@ -1 +1 @@
-Subproject commit a1162fdb1d1f4450a8d6d15e9faab1c826c79abd
+Subproject commit b256e4425290b4d1220d8b173dd116e12041ccad