travis: install libgirepository

.travis.yml

@@ -10,6 +10,7 @@ before_install:
   - sudo add-apt-repository -y ppa:vala-team/ppa
   - sudo apt-get update -qq
   - sudo apt-get install -qq ${VALAC}
+  - sudo apt-get install -qq libgirepository1.0-dev
   - sudo apt-get install -qq gir1.2-gee-0.8 libgee-0.8-dev
   - sudo apt-get install -qq gir1.2-json-1.0 libjson-glib-dev
   - sudo apt-get install -qq gir1.2-notify-0.7 libnotify-dev