.travis.yml in slack-ruby-client-0.5.2 vs .travis.yml in slack-ruby-client-0.5.3

@@ -1,17 +1,23 @@
+language: ruby
+
+cache: bundler
+
 rvm:
   - 2.2
   - 2.1
   - 2.0
-  - rbx-2.9
+  - rbx-2
   - jruby-19mode
   - ruby-head
   - jruby-head
 
 matrix:
   allow_failures:
     - rvm: ruby-head
     - rvm: jruby-head
+    - rvm: jruby-19mode
+    - rvm: rbx-2
 
 git:
   submodules: false
 
 env: