Update prezto

diff --git a/prezto b/prezto
index ec3d63abeeadac501e1367f1e3878b6ad3047cc3..6606cc66f3713b8fafe2265e60cc132dab1f8763 160000 (submodule)
--- a/prezto
+++ b/prezto
@@ -1 +1 @@
-Subproject commit ec3d63abeeadac501e1367f1e3878b6ad3047cc3
+Subproject commit 6606cc66f3713b8fafe2265e60cc132dab1f8763