add puppet 4.0 to travis matrix

Author: jhoblitt

.travis.yml

@@ -8,8 +8,11 @@ rvm:
   - 2.1
 env:
   - PUPPET_GEM_VERSION="~> 3.3"
-  - PUPPET_GEM_VERSION="~> 3.7" FUTURE_PARSER="yes"
+  - PUPPET_GEM_VERSION="~> 4.0"
 matrix:
+  exclude:
+    - rvm: 1.8.7
+      env: PUPPET_GEM_VERSION="~> 4.0"
   fast_finish: true
 notifications:
   email: false