Support "Build-Depends: dh-sequence-dist-zilla" instead of "dh $@ --with dist-zilla"

Implemented by adding the according Provides.

Also adds documentation of this to dh-dist-zilla.pod.

Author: xtaran

debian/changelog

@@ -1,3 +1,10 @@
+dh-dist-zilla (1.4.0) UNRELEASED; urgency=medium
+
+  * Support "Build-Depends: dh-sequence-dist-zilla" instead of "dh $@
+    --with dist-zilla" by adding according Provides. Document this, too.
+
+ -- Axel Beckert <abe@debian.org>  Fri, 21 Feb 2020 00:54:13 +0100
+
 dh-dist-zilla (1.3.7) unstable; urgency=medium
 
   * Add dependency on debhelper (<< 10.10.6~) | debhelper (>= 11.1.3~) to

debian/control

@@ -12,6 +12,7 @@ Homepage: https://github.com/elmar/dh-dist-zilla
 Rules-Requires-Root: no
 
 Package: dh-dist-zilla
+Provides: dh-sequence-dist-zilla
 Architecture: all
 Multi-Arch: foreign
 Depends: debhelper (>= 7),

dh-dist-zilla.pod

@@ -4,18 +4,24 @@ dh-dist-zilla - debhelper add-on to run dzil (Dist::Zilla) during build
 
 =head1 DESCRIPTION
 
-The dh-dist-zilla package provides a sequence addon for debhelper 7 which
-can be used in the following way:
+The dh-dist-zilla package provides a sequence addon for debhelper 7
+and above which can be used in the following two ways:
+
+In C<debian/rules> since debhelper 7:
 
     #!/usr/bin/make -f
     export DH_VERBOSE=1
     %:
         dh $@ --with dist-zilla
 
-This will call C<dzil build> prior to C<dh_auto_configure>, C<dzil clean>
-before C<dh_clean> and will add the option C<-D I<build-directory>> to
-C<dh_auto_configure>, C<dh_auto_build>, C<dh_auto_install>, and
-C<dh_auto_test>.
+Since debhelper 11.4 alternatively also just in C<debian/control>:
+
+    Build-Depends: dh-sequence-dist-zilla
+
+Both variants will call C<dzil build> prior to C<dh_auto_configure>,
+C<dzil clean> before C<dh_clean> and will add the option C<-D
+I<build-directory>> to C<dh_auto_configure>, C<dh_auto_build>,
+C<dh_auto_install>, and C<dh_auto_test>.
 
 =head2 How to generate the .orig.tar.xz "upstream" tar-ball