debian: Switch to "3.0 (native)" source format.

[notmuch] / debian / source / format

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)