Update Sizzle: fixes a small bug in class matching

diff --git a/src/sizzle b/src/sizzle
index 1b3f3d1444206362f4b49c348a686e546d4f0dbd..06818c2767cb7e73c776eb849d2714e6048a4694 160000 (submodule)
--- a/src/sizzle
+++ b/src/sizzle
@@ -1 +1 @@
-Subproject commit 1b3f3d1444206362f4b49c348a686e546d4f0dbd
+Subproject commit 06818c2767cb7e73c776eb849d2714e6048a4694