Update postinst file to follow v2 security elements

Change-Id: I17e11e05043ba864052419604096e72a6238ec9c
diff --git a/repo-ng/Makefile b/repo-ng/Makefile
index ae5503b..0b6ad49 100644
--- a/repo-ng/Makefile
+++ b/repo-ng/Makefile
@@ -11,6 +11,6 @@
 VERSION=0.0.12-gd45e62b0
 
 # PPA version
-PPA_VERSION=2
+PPA_VERSION=3
 
 include ../packaging.mk