.travis.yml in ridgepole-0.7.2.beta vs .travis.yml in ridgepole-0.7.2

@@ -7,10 +7,12 @@
   - apt
 rvm:
   - 2.2.9
   - 2.3.6
   - 2.4.3
+  - 2.5.0
 before_install:
+  - gem update --system
   - gem install bundler
 before_script:
   - sudo service mysql stop
   - sudo service postgresql stop
   - docker-compose up -d