Update prezto

diff --git a/prezto b/prezto
index 54fe2c7f5b05636043970f703ab23bcc7b3d40be..a104047c8b3ae27ce1e6f836ff4087b1af87d743 160000 (submodule)
--- a/prezto
+++ b/prezto
@@ -1 +1 @@
-Subproject commit 54fe2c7f5b05636043970f703ab23bcc7b3d40be
+Subproject commit a104047c8b3ae27ce1e6f836ff4087b1af87d743