fixed travis ci integration

.travis.yml

@@ -1,6 +1,6 @@
 language: ruby
 rvm:
-- 2.2.5
+  - 2.2.5
 
 #before_script:
 # - chmod +x ./script/cibuild # or do this locally and commit
@@ -9,15 +9,3 @@ rvm:
 # the `install` step will run `bundle install` by default.
 script: jekyll build
 # for html5proof ./script/cibuild && jekyll build && htmlproofer ./_site
-
-# branch whitelist, only for GitHub Pages
-branches:
-  only:
-# - gh-pages     # test the gh-pages branch
-  - /pages-(.*)/ # test every branch which starts with "pages-"
-
-env:
-  global:
-  - NOKOGIRI_USE_SYSTEM_LIBRARIES=true # speeds up installation of html-proofer
-
-sudo: false # route your build to the container-based infrastructure for a faster build