.travis.yml in lita-4.6.1 vs .travis.yml in lita-4.7.0

@@ -13,9 +13,10 @@
     - rvm: rbx-2
   fast_finish: true
 script: bundle exec rake
 before_install:
   - gem update --system
+  - gem update bundler
 services:
   - redis-server
 branches:
   except:
     - /^v[0-9]/