Use Travis containers

dszeto · dszeto · commit da837dab766f · 2016-03-28T17:23:17.000-07:00
diff --git a/.travis.yml b/.travis.yml
@@ -9,6 +9,8 @@ rvm:
 
 gemfile: docs/manual/Gemfile
 
+sudo: false
+
 script:
   - cd docs/manual
   - bundle exec middleman build
