.travis.yml in pdd-0.15.2 vs .travis.yml in pdd-0.15.3

@@ -3,12 +3,15 @@
   - 2.0.0
 cache: bundler
 branches:
   only:
     - master
+addons:
+  apt:
+    packages:
+      - libmagic1
+      - libmagic-dev
 install:
-  - sudo apt-get update
-  - travis_retry sudo apt-get install -y --fix-missing libmagic1 libmagic-dev
-  - travis_retry bundle install
+  - travis_retry bundle update
 script:
   - rake