.travis.yml in less-rails-2.1.5 vs .travis.yml in less-rails-2.1.6

@@ -1,8 +1,10 @@
 rvm:
   - 1.8.7
   - 1.9.2
   - 1.9.3
   - ree
+before_install:
+  - gem update --system
 gemfile:
   - Gemfile.rails-3.1
   - Gemfile.rails-3.2