Merge pull request #121 from jeffmccune/fix/master/travis

Future proof travis build matrix

Author: Jeff McCune

.travis.yml

@@ -6,10 +6,16 @@ notifications:
 rvm:
   - 1.9.3
   - 1.8.7
+  - ruby-head
 env:
-  - PUPPET_GEM_VERSION="~> 2.7.0"
-  - PUPPET_GEM_VERSION=">= 3.0.0"
+  - PUPPET_GEM_VERSION="~> 2.7"
+  - PUPPET_GEM_VERSION="~> 3"
 matrix:
+  allow_failures:
+    - rvm: ruby-head
   exclude:
     - rvm: 1.9.3
-      env: PUPPET_GEM_VERSION="~> 2.7.0"
+      env: PUPPET_GEM_VERSION="~> 2.7"
+  exclude:
+    - rvm: ruby-head
+      env: PUPPET_GEM_VERSION="~> 2.7"