.travis.yml in review-3.2.0 vs .travis.yml in review-4.0.0

@@ -14,10 +14,10 @@
       - texlive-latex-recommended
       - dvipng
 
 before_install:
   - |-
-    gem update --system
+##    gem update --system
     gem install bundler
     gem install epubcheck-ruby
 
 script:
   - bundle exec rake