add apticron_jessie symlink, same version in wheezy and sid

diff --git a/templates/Debian/apticron_jessie.erb b/templates/Debian/apticron_jessie.erb
new file mode 120000 (symlink)
index 0000000..a9a3a6f
--- /dev/null
+++ b/templates/Debian/apticron_jessie.erb
@@ -0,0 +1 @@
+apticron_wheezy.erb
\ No newline at end of file