.travis.yml in serverengine-1.5.11 vs .travis.yml in serverengine-1.6.0

@@ -1,13 +1,13 @@
 language: ruby
 
 rvm:
-  - 1.9.3
-  - 2.0
-  - 2.1
   - 2.2
 
 branches:
   only:
     - master
 
 script: bundle exec rake spec
+
+before_install:
+ - gem update bundler