Version bump to QP1A.181219.004

Change-Id: I693c1c8a10b74bb995c4bd7e7b91c3269cb1ea78
diff --git a/core/build_id.mk b/core/build_id.mk
index 015b3a9..5259541 100644
--- a/core/build_id.mk
+++ b/core/build_id.mk
@@ -18,4 +18,4 @@
 # (like "CRB01").  It must be a single word, and is
 # capitalized by convention.
 
-BUILD_ID=QP1A.181219.003
+BUILD_ID=QP1A.181219.004