Update bundler gem instead of install for pre_install travis config

shadabahmed · shadabahmed · commit 396dfb719a74 · 2015-12-19T00:27:19.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,6 @@
 language: ruby
 before_install:
-  - gem install bundler
+  - gem update bundler
 bundler_args: --without guard
 script: "bundle exec rake ci"
 rvm:
