SEBA-271 update to plyxproto-3.1.0

Change-Id: I29a42c27c7f5c55110beb1eee2b48afcecc84ffb
diff --git a/VERSION b/VERSION
index 348fc11..ea4bd0f 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.1.12
+2.1.13