.travis.yml in jekyll-minifier-0.1.6 vs .travis.yml in jekyll-minifier-0.1.8

@@ -7,7 +7,7 @@
     tags: true
     all_branches: true
     repo: digitalsparky/jekyll-minifier
 language: ruby
 rvm:
-- 2.3.1
-script: bundle exec rspec spec
+  - 2.3.1
+script: JEKYLL_ENV="production" bundle exec rspec spec