Update plomlib.

diff --git a/plomlib b/plomlib
index 922a5599778859f950c78b516d8bdb478830ebe9..f2dc66a2d4f1e8823246d1621b424e44ec423897 160000 (submodule)
--- a/plomlib
+++ b/plomlib
@@ -1 +1 @@
-Subproject commit 922a5599778859f950c78b516d8bdb478830ebe9
+Subproject commit f2dc66a2d4f1e8823246d1621b424e44ec423897