Add salt-formula-heka as a build-dep
diff --git a/debian/control b/debian/control
index 5580a5c..8200bdb 100644
--- a/debian/control
+++ b/debian/control
@@ -2,7 +2,7 @@
Maintainer: Jan Kaufman <jan.kaufman@tcpcloud.eu>
Section: admin
Priority: optional
-Build-Depends: debhelper (>= 9), salt-master, python, python-yaml
+Build-Depends: debhelper (>= 9), salt-master, python, python-yaml, salt-formula-heka
Standards-Version: 3.9.6
Homepage: http://www.tcpcloud.eu
Vcs-Browser: https://github.com/tcpcloud/salt-formula-rsyslog