remove allowing failures for 4.0

.travis.yml

@@ -16,8 +16,5 @@ matrix:
     env: PUPPET_GEM_VERSION="~> 3.0" FUTURE_PARSER="yes"
   - rvm: 2.1.6
     env: PUPPET_GEM_VERSION="~> 4.0" STRICT_VARIABLES="yes"
-  allow_failures:
-    - rvm: 2.1.6
-      env: PUPPET_GEM_VERSION="~> 4.0" STRICT_VARIABLES="yes"
 notifications:
   email: false