.travis.yml in volay-0.6.0 vs .travis.yml in volay-0.7.0

@@ -2,10 +2,11 @@
 rvm:
   - 1.9.3
   - 2.0.0
   - 2.1.0
 
-before_script:
+before_install:
   - export DISPLAY=:99.0
   - sh -e /etc/init.d/xvfb start
+  - sudo apt-get install -y libgirepository1.0-dev
 
 script: bundle exec rake