Fix drone pipeline

.drone.yml

@@ -9,7 +9,7 @@ steps:
   - name: debhost
     path: /debian
   commands:
-    - apt-get update && apt-get install -y dpkg-dev
+    - apt-get update && apt-get install -y dpkg-dev debhelper
     - dpkg-buildpackage -us -uc
     - cp ../lch_0.6.10.deb .
     - dpkg -i lch_0.6.10.deb