.travis.yml in monetize-1.9.0 vs .travis.yml in monetize-1.9.1

@@ -6,10 +6,13 @@
   - 2.1.10
   - 2.2.10
   - 2.3.7
   - 2.4.4
   - 2.5.1
+  - 2.6.0
   - jruby-9.0.5.0
+before_install:
+  - gem install bundler --version '~> 1.17'
 script: bundle exec rspec spec
 notifications:
   recipients:
     - [e-mail]