Version bump to PD1A.180720.019

Change-Id: I5f05c72bf7077849639c6f1dc9654e3abe849545
diff --git a/core/build_id.mk b/core/build_id.mk
index 65c712b..580f4fe 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.
 
-export BUILD_ID=PD1A.180720.018
+export BUILD_ID=PD1A.180720.019