Sizzle docs and README updates

diff --git a/src/sizzle b/src/sizzle
index e0ffa9e448620b19d9a2797084100418320cea01..390746953b51d4f940c2d05b0b77baec7bd379e3 160000 (submodule)
--- a/src/sizzle
+++ b/src/sizzle
@@ -1 +1 @@
-Subproject commit e0ffa9e448620b19d9a2797084100418320cea01
+Subproject commit 390746953b51d4f940c2d05b0b77baec7bd379e3