.travis.yml in brightbox-cli-2.6.0 vs .travis.yml in brightbox-cli-2.7.0

@@ -1,7 +1,11 @@
 language: ruby
 sudo: false
+before_install:
+  - gem install bundler
 rvm:
-  - 1.9.3
-  - 2.0.0
-  - 2.1.0
-  - 2.2.4
+  - 1.9
+  - 2.0
+  - 2.1
+  - 2.2
+  - 2.3
+  - 2.4