Fix Travis script (remove sudo)

.travis.yml

@@ -10,10 +10,14 @@ env:
       # Code Climate Integration
       secure: IHUYMK2spxorl9lUeAbAfT6btuP2qRT615bUnEuUDgYrXf9y1CdQprYWJaygou/+6aWmLL0NnxYSpOxi40bHgMKeUQnTjXVbkkqQ1Tml3cMSsjkBrx7CNUygHvDDzCQCEC6m9uZjUKMZAVzVSWlOQhSMKR7MtdsSvMCrKIgA2pM=
 
+addons:
+  apt:
+    packages:
+      - ghostscript
+
 before_install:
   - if [ $TRAVIS_PULL_REQUEST == "false" ]; then git clone https://github.com/$TRAVIS_REPO_SLUG.git $TRAVIS_REPO_SLUG && cd $TRAVIS_REPO_SLUG && git checkout -qf $TRAVIS_BRANCH; fi
   - if [ $TRAVIS_PULL_REQUEST == "true" ]; then git checkout -qf master && git checkout -qf $TRAVIS_COMMIT; fi
-  - sudo apt-get install ghostscript
   - convert -version
   - gs -v
   - 'echo ''gem: --no-ri --no-rdoc'' > ~/.gemrc'