Use the latest bundler in Travis CI builds

This is an attempt to fix failing builds like this one [1]. [1]: https://travis-ci.org/freerange/mocha/jobs/140040641
freerange · Jun 24, 2016 · 0e3eed1 · 0e3eed1
1 parent 7e1c2bf
commit 0e3eed1
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/.travis.yml b/.travis.yml
@@ -1,3 +1,5 @@
+before_install:
+  - gem install bundler
 bundler_args: "--verbose"
 script: "rake test"
 rvm: