Update Security String to 2018-12-05 in Master
bug: 117667960
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index ee5f8ff..445618c 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -256,7 +256,7 @@
     #  It must be of the form "YYYY-MM-DD" on production devices.
     #  It must match one of the Android Security Patch Level strings of the Public Security Bulletins.
     #  If there is no $PLATFORM_SECURITY_PATCH set, keep it empty.
-      PLATFORM_SECURITY_PATCH := 2018-11-05
+      PLATFORM_SECURITY_PATCH := 2018-12-05
 endif
 .KATI_READONLY := PLATFORM_SECURITY_PATCH