Bump debhelper version to 11.

debian/changelog

@@ -4,6 +4,7 @@ dulwich (0.19.7-1) UNRELEASED; urgency=medium
   * New upstream release.
    + Drop patch 02_newer_git: applied upstream.
   * Bump standards version to 4.2.1
+  * Bump debhelper version to 11.
 
  -- Jelmer Vernooij <jelmer@debian.org>  Mon, 05 Nov 2018 19:27:07 +0000
 

debian/compat

@@ -1 +1 @@
-9
+11

debian/control

@@ -4,7 +4,7 @@ Priority: optional
 Maintainer: Debian Python Modules Team <python-modules-team@lists.alioth.debian.org>
 Uploaders: Jelmer Vernooij <jelmer@debian.org>
 Homepage: https://www.dulwich.io/
-Build-Depends: debhelper (>= 9.20160114),
+Build-Depends: debhelper (>= 11),
                dh-python,
                git (>= 1:1.7.0.4-2) [!alpha !ppc64 !sparc64 !x32 !ia64],
                pypy-dev [!hurd-any !m68k !sh4 !x32 !hppa !powerpcspe],