Speed up a bit the build process on Travis

Let's rely on a pre-installed version of Ruby to avoid having to install it and also only require Jekyll as a dependency as we only depend on that and it's the same cost to ensure that this gem or the github-pages one is up-to-date.
propelorm · Feb 24, 2017 · 7447d3f · 7447d3f
1 parent 23c1ba3
commit 7447d3f
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diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,5 @@
 language: ruby
 
-rvm: 2.1.7
+rvm: 2.3.1
 
 script: "bundle exec jekyll build"
diff --git a/Gemfile b/Gemfile
@@ -1,3 +1,3 @@
 source 'https://rubygems.org'
 
-gem 'github-pages', '~> 112'
+gem 'jekyll', '~> 3.3.1'