.travis.yml in countries-2.0.0.pre.2 vs .travis.yml in countries-2.0.0.pre.3

@@ -4,8 +4,11 @@
 rvm:
  - 1.9.3
  - 2.0.0
  - 2.2.3
  - ruby-head
+before_install:
+  - gem update --system
+  - gem install bundler --pre
 matrix:
   allow_failures:
     - rvm: ruby-head