ndnmap-data-collector: Fix upstart config

Change-Id: Ib4453a3e783a77868c7ee3586b0c357ccf7f0afe
diff --git a/ndnmap-data-collector/Makefile b/ndnmap-data-collector/Makefile
index b55b59f..bd4a41a 100644
--- a/ndnmap-data-collector/Makefile
+++ b/ndnmap-data-collector/Makefile
@@ -11,6 +11,6 @@
 VERSION=0.1.0-1
 
 # PPA version
-PPA_VERSION=3
+PPA_VERSION=4
 
 include ../packaging.mk