frontend: update lib ref

wilhelmguo · wilhelmguo · commit ee55ce738a6e · 2018-12-07T17:46:56.000+08:00
diff --git a/src/frontend/lib b/src/frontend/lib
@@ -1 +1 @@
-Subproject commit 63edb9f0dd6b937f0a75763dc5796b89da3e1226
+Subproject commit 6e2cd9467926b62334aec41f6e1a8f038e6786b4
