[damned-lies] Refs #236 - Add libxml2-dev to test setup config

[Claude Paroz <claudep src gnome org>]

commit cc0927eea25046308758624e337b3bd072417046
Author: Claude Paroz <claude 2xlibre net>
Date:   Tue Jun 8 08:30:46 2021 +0200

    Refs #236 - Add libxml2-dev to test setup config

 .gitlab-ci.yml  | 2 +-
 CONTRIBUTING.md | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 9bf15e08..a0bac908 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -5,7 +5,7 @@ stages:
   - test
 
 before_script:
-  - apt update -qq && apt install -y -qq libicu-dev python3-icu python3-aeidon gettext intltool itstool 
yelp-tools yelp-xsl gnome-doc-utils
+  - apt update -qq && apt install -y -qq libicu-dev libxml2-dev python3-icu python3-aeidon gettext intltool 
itstool yelp-tools yelp-xsl gnome-doc-utils
   - pip install -r requirements.txt
 
 pages:
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 7c611275..5730f499 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -88,11 +88,11 @@ You can install them on your operating system using the following command line e
 
 * On **Debian** based systems:
   ```bash
-  apt install gettext intltool gnome-doc-utils itstool libmariadbclient-dev libicu-dev python3-dev 
yelp-tools build-essential
+  apt install gettext intltool gnome-doc-utils itstool libmariadbclient-dev libicu-dev libxml2-dev 
python3-dev yelp-tools build-essential
   ```
 * On **Fedora** based systems:
   ```
-  dnf install gettext intltool gnome-doc-utils itstool mariadb-devel libicu-devel python-devel yelp-tools 
@development-tools
+  dnf install gettext intltool gnome-doc-utils itstool mariadb-devel libicu-devel libxml2-devel python-devel 
yelp-tools @development-tools
   ```