debian: Set Debian source format to 3.0 (native).

Signed-off-by: Michael Prokop <mika@grml.org>

diff --git a/debian/source/format b/debian/source/format
new file mode 100644 (file)
index 0000000..89ae9db
--- /dev/null
+++ b/debian/source/format
@@ -0,0 +1 @@
+3.0 (native)