.travis.yml in domain_prefix-0.3.0.13 vs .travis.yml in domain_prefix-0.3.0.15

@@ -1,6 +1,11 @@
 language: ruby
+install:
+  - gem uninstall bundler
+  - gem install bundler --version '1.11.2'
+  - bundle install
 rvm:
   - 1.9.3
   - 2.0.0
   - 2.1.5
   - 2.2.0
+  - 2.3.0