This has been suggested by lintian:
P: tweeper source: package-uses-old-debhelper-compat-version 9
Section: php
Priority: optional
Maintainer: Antonio Ospite <ao2@ao2.it>
Section: php
Priority: optional
Maintainer: Antonio Ospite <ao2@ao2.it>
-Build-Depends: debhelper (>= 9), pkg-php-tools (>= 1.7~)
+Build-Depends: debhelper (>= 11), pkg-php-tools (>= 1.7~)
Build-Depends-Indep: asciidoc, xmlto
Standards-Version: 4.0.0
Homepage: https://git.ao2.it/tweeper.git
Build-Depends-Indep: asciidoc, xmlto
Standards-Version: 4.0.0
Homepage: https://git.ao2.it/tweeper.git