Upgrade upstream to 3.4.1

asottile · asottile · commit 8da62f014a66 · 2016-12-19T05:34:31.000-08:00
diff --git a/libsass b/libsass
@@ -1 +1 @@
-Subproject commit 5b92405db76df2acf620fbaf37e3d1c3662af720
+Subproject commit b9b57560defbaa4d1925765fe3826a8631104908
