Update 2.3 Ruby

Author: petems

.travis.yml

@@ -5,43 +5,43 @@ before_install:
 matrix:
   fast_finish: true
   include:
-  - rvm: '2.1'
+  - rvm: '2.3'
     sudo: required
     services: docker
     env: SUITE=centos-6-docker
     script:
       - bundle exec rake acceptance:suite_on_nodeset['centos-6-docker']
-  - rvm: '2.1'
+  - rvm: '2.3'
     sudo: required
     services: docker
     env: SUITE=centos-7-docker
     script:
       - bundle exec rake acceptance:suite_on_nodeset['centos-7-docker']
-  - rvm: '2.1'
+  - rvm: '2.3'
     sudo: required
     services: docker
     env: SUITE=debian-7-docker
     script:
       - bundle exec rake acceptance:suite_on_nodeset['debian-7-docker']
-  - rvm: '2.1'
+  - rvm: '2.3'
     sudo: required
     services: docker
     env: SUITE=debian-8-docker
     script:
       - bundle exec rake acceptance:suite_on_nodeset['debian-8-docker']
-  - rvm: '2.1'
+  - rvm: '2.3'
     sudo: required
     services: docker
     env: SUITE=ubuntu-1404-docker
     script:
       - bundle exec rake acceptance:suite_on_nodeset['ubuntu-1404-docker']
-  - rvm: '2.1'
+  - rvm: '2.3'
     sudo: required
     services: docker
     env: SUITE=ubuntu-1604-docker
     script:
       - bundle exec rake acceptance:suite_on_nodeset['ubuntu-1604-docker']
-  - rvm: '2.1'
+  - rvm: '2.3'
     sudo: required
     services: docker
     env: SUITE=amazon-linux-20172-docker