Use debhelper-compat instead of debian/compat

debian/changelog

 python-geoip2 (2.9.0+dfsg1-2) UNRELEASED; urgency=medium
 
   * Convert git repository from git-dpm to gbp layout
+  * Use debhelper-compat instead of debian/compat.
 
  -- Ondřej Nový <onovy@debian.org>  Wed, 08 Aug 2018 09:14:23 +0200
 

debian/compat

-11

debian/control

@@ -5,7 +5,7 @@ Uploaders: Martin Kratochvíl <martin.krata@gmail.com>,
            Ondřej Kobližek <koblizeko@gmail.com>,
 Section: python
 Priority: optional
-Build-Depends: debhelper (>= 11),
+Build-Depends: debhelper-compat (= 11),
                dh-python,
                python-all,
                python-ipaddress,