Update .travis.yml

Author: davejrt

.travis.yml

@@ -3,16 +3,21 @@ language: ruby
 bundler_args: --without development system_tests
 before_install: rm Gemfile.lock || true
 sudo: false
-rvm:
-  - 2.1.6
-  - 2.2.5
-  - 2.3.3
+
 script:
   - bundle exec rake test
   - bundle exec rubocop lib
   - bundle exec puppet-lint --no-autoloader_layout-check manifests
-env:
-  - PUPPET_GEM_VERSION="~> 4.0"
-  - PUPPET_GEM_VERSION="~> 5.0"
 matrix:
   fast_finish: true
+  include:
+  - rvm: 2.3.3
+    env: PUPPET_GEM_VERSION="~> 4.0"
+  - rvm: 2.3.3
+    env: PUPPET_GEM_VERSION="~> 5.0"
+  - rvm: 2.2.5
+    env: PUPPET_GEM_VERSION="~> 4.0"
+  - rvm: 2.1.6
+    env: PUPPET_GEM_VERSION="~> 4.0"
+  
+