.travis.yml in surrounded-0.9.9 vs .travis.yml in surrounded-0.9.10

- old
+ new

@@ -1,17 +1,16 @@
+before_install:
+  - gem install bundler
 language: ruby
 cache: bundler
 rvm:
-  - 2.0.0
-  - 2.1.5
-  - 2.2.2
+  - 2.3.1
+  - 2.2.5
+  - 2.1.10
   - ruby-head
   - jruby-head
-  - rbx
 env:
 - COVERALLS=true
 matrix:
   allow_failures:
-    - rvm: 2.0.0
     - rvm: ruby-head
     - rvm: jruby-head
-    - rvm: rbx