.travis.yml in pinch_hitter-0.5.5 vs .travis.yml in pinch_hitter-0.5.6

@@ -2,5 +2,7 @@
 rvm:
   - 1.9.3
   - 2.0.0
   - 2.1.5
   - 2.2.2
+before_install:
+  - gem update bundler