Set Gerrit to 3.12.0

Change-Id: I833b97106954cfc1e8aa19be7c979adaa2ac7ee2
diff --git a/Version.mk b/Version.mk
index dc157f4..3bc3646 100644
--- a/Version.mk
+++ b/Version.mk
@@ -1,4 +1,4 @@
 VERSION=3.12.0
-WAR_VERSION=3.12.0-rc6
+WAR_VERSION=3.12.0
 BRANCH=stable-3.12
-RELEASE=0rc6
+RELEASE=1