Bump debhelper from old 12 to 13.

Changes-By: lintian-brush
Fixes: lintian: package-uses-old-debhelper-compat-version
See-also: https://lintian.debian.org/tags/package-uses-old-debhelper-compat-version.html

debian/changelog

 ruby-jekyll-gist (1.5.0-3) UNRELEASED; urgency=low
 
   * Update standards version to 4.5.0, no changes needed.
+  * Bump debhelper from old 12 to 13.
 
  -- Debian Janitor <janitor@jelmer.uk>  Sat, 18 Jul 2020 07:28:16 -0000
 

debian/control

@@ -3,7 +3,7 @@ Section: ruby
 Priority: optional
 Maintainer: Debian Ruby Team <pkg-ruby-extras-maintainers@lists.alioth.debian.org>
 Uploaders: Youhei SASAKI <uwabami@gfd-dennou.org>
-Build-Depends: debhelper-compat (= 12),
+Build-Depends: debhelper-compat (= 13),
                gem2deb,
                ruby-octokit
 Standards-Version: 4.5.0