Stop testing against Puppet < 3.8

Author: Aaron Russo

.travis.yml

@@ -15,13 +15,5 @@ notifications:
     - [email protected]
 
 env:
-  - PUPPET_VERSION="~> 2.7.0"
-  - PUPPET_VERSION="~> 3.5.0"
-  - PUPPET_VERSION="~> 3.6.0"
-  - PUPPET_VERSION="~> 3.7.0"
-  - PUPPET_VERSION="~> 3.7.0" FUTURE_PARSER="yes"
-
-matrix:
-  exclude:
-    - rvm: 2.0.0
-      env: PUPPET_VERSION="~> 2.7.0"
+  - PUPPET_VERSION="~> 3.8.0"
+  - PUPPET_VERSION="~> 3.8.0" FUTURE_PARSER="yes"