The debhelper compatibility version used by this package is marked as experimental by the debhelper developer. You should consider using a stable compatibility version instead.
The compatibility version can be set by specifying
debhelper-compat (= 12) in your package's
Build-Depends, by the legacy
debian/compat file or
even by setting and exporting DH_COMPAT in
debian/rules. If it
is not set in either place, debhelper defaults to the deprecated
compatibility version 1.