.travis.yml in berkshelf-bzr-0.4.0 vs .travis.yml in berkshelf-bzr-1.0.0

@@ -1,13 +1,20 @@
+sudo: true
+language: ruby
+cache: bundler
+
 before_install:
   - sudo apt-get update -qq
   - sudo apt-get install bzr
   - bzr whoami 'Test <[e-mail]>'
 
-rvm:
-  - 1.9.3
-  - 2.0.0
-  - 2.1.0
+matrix:
+  include:
+    - rvm: 2.2.5
+    - rvm: 2.3.1
+    - rvm: ruby-head
+  allow_failures:
+    - rvm: ruby-head
 
 bundler_args: --jobs 7
 
 script: bundle exec rake travis:ci