Fix build matrix

Author: stephenrjohnson

.travis.yml

@@ -1,17 +1,10 @@
 language: ruby
 bundler_args: --without system_tests
 rvm:
-  - 2.3.1
-  - 1.9.3
+  - 2.0.0
 script: "bundle exec rake test"
 env:
   - "PUPPET_GEM_VERSION='< 4.0.0' FUTURE_PARSER='yes' STRICT_VARIABLES='no'"
   - "PUPPET_GEM_VERSION='< 4.0.0' FUTURE_PARSER='yes' STRICT_VARIABLES='yes'"
   - "PUPPET_GEM_VERSION='> 4.0.0'"
   - "PUPPET_GEM_VERSION='> 4.0.0' STRICT_VARIABLES='yes'"
-matrix:
-  exclude:
-  - rvm: 2.3.1
-    env: "PUPPET_GEM_VERSION='> 4.0.0'"
-  - rvm: 2.3.1
-    env: "PUPPET_GEM_VERSION='> 4.0.0' STRICT_VARIABLES='yes'"