Add debian/watch file

This source package is not Debian-native. To check upstream for new
upstream versions by the Debian External Health Status project a
debian/watch file is needed.
Fix lintian info debian-watch-file-is-missing

diff --git a/debian/watch b/debian/watch
new file mode 100644 (file)
index 0000000..f0be410
--- /dev/null
+++ b/debian/watch
@@ -0,0 +1,3 @@
+version=4
+https://www.anytun.org/download/ \
+uanytun-([\d\.]+)\.tar\.gz