[simple-scan/gnome-3-20] Add yelp-tools to CI/build instructions

[Robert Ancell <rancell src gnome org>]

commit 1222cc625ca698e6cb7e78f306ef29d27f4bd110
Author: Robert Ancell <robert ancell canonical com>
Date:   Mon Aug 27 15:45:36 2018 +1200

    Add yelp-tools to CI/build instructions

 .gitlab-ci.yml | 2 +-
 README.md      | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 3cc8307..0ddeff0 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -2,7 +2,7 @@ build-ubuntu:
   image: ubuntu:xenial
   before_script:
     - apt-get update
-    - apt-get install -q -y --no-install-recommends autoconf automake gettext valac gcc gettext intltool 
itstool libgtk-3-dev libgusb-dev libcolord-dev libpackagekit-glib2-dev libsane-dev
+    - apt-get install -q -y --no-install-recommends autoconf automake gettext intltool libgtk-3-dev 
libgusb-dev libcolord-dev libpackagekit-glib2-dev libsane-dev valac yelp-tools
   script:
     - ./autogen.sh
     - make install
diff --git a/README.md b/README.md
index 1b25e25..58ae81f 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ scanners) that have suitable [SANE drivers](http://sane-project.org/) installed.
 
 Install the dependencies (first line is Ubuntu/Debian, second is Fedora):
 ```
-$ sudo apt install git autoconf automake gettext intltool itstool valac libgtk-3-dev libgusb-dev 
libcolord-dev libpackagekit-glib2-dev libsane-dev
+$ sudo apt install git autoconf automake gettext intltool libgtk-3-dev libgusb-dev libcolord-dev 
libpackagekit-glib2-dev libsane-dev valac yelp-tools
 ```
 ```
 $ sudo dnf install -y vala gettext itstool gtk3-devel libgusb-devel colord-devel PackageKit-glib-devel 
sane-backends-devel