[grilo] travis: add zlib1g-dev dependency

[Juan A. Suarez Romero <jasuarez src gnome org>]

commit 1e35ceba8eee1f908a69fbe8442a0c22066c447a
Author: Juan A. Suarez Romero <jasuarez igalia com>
Date:   Tue Jun 24 18:29:35 2014 +0200

    travis: add zlib1g-dev dependency

 .travis.yml |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/.travis.yml b/.travis.yml
index 2dac815..7b1a806 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,7 +6,7 @@ before_install:
   - sudo apt-get update -qq
   - sudo apt-get install -qq gnome-common gtk-doc-tools libglib2.0-dev
          libxml2-dev libgtk-3-dev liboauth-dev libsoup2.4-dev valac
-         gobject-introspection libgirepository1.0-dev
+         gobject-introspection libgirepository1.0-dev zlib1g-dev
 script:
   - ./autogen.sh
   - make