pull in latest nblibs

diff --git a/nblibs b/nblibs
index 70ffba7c870a9ca34361db88e60494502db4fbbe..4a83fcbc97e9a73d4089fea66044fb90814bae65 160000 (submodule)
--- a/nblibs
+++ b/nblibs
@@ -1 +1 @@
-Subproject commit 70ffba7c870a9ca34361db88e60494502db4fbbe
+Subproject commit 4a83fcbc97e9a73d4089fea66044fb90814bae65