Merge branch 'lintian-fixes' into 'master'

Fix some issues reported by lintian

See merge request python-team/modules/python-pygerrit2!1

debian/changelog

+python-pygerrit2 (2.0.4-3) UNRELEASED; urgency=medium
+
+  * Bump debhelper from old 11 to 12.
+  * Set upstream metadata fields: Bug-Database, Bug-Submit, Repository,
+    Repository-Browse.
+
+ -- Debian Janitor <janitor@jelmer.uk>  Mon, 13 Apr 2020 22:50:08 +0000
+
 python-pygerrit2 (2.0.4-2) unstable; urgency=medium
 
   * Team upload.

debian/control

@@ -5,7 +5,7 @@ Maintainer: Debian Python Modules Team <python-modules-team@lists.alioth.debian.
 Uploaders:
  Filip Pytloun <filip@pytloun.cz>,
 Build-Depends:
- debhelper-compat (= 11),
+ debhelper-compat (= 12),
  dh-python,
  python3-all,
  python3-pbr (>= 0.8.2),

debian/upstream/metadata

+Bug-Database: https://github.com/dpursehouse/pygerrit2/issues
+Bug-Submit: https://github.com/dpursehouse/pygerrit2/issues/new
+Repository: https://github.com/dpursehouse/pygerrit2.git
+Repository-Browse: https://github.com/dpursehouse/pygerrit2