Nokogiri 1.7.0 released, requires ruby 2.1+

.travis.yml

@@ -15,7 +15,6 @@ rvm:
   - 2.3.0
   - 2.2.2
   - 2.1.6
-  - 2.0.0
   - rbx
 gemfile:
   - Gemfile
@@ -29,6 +28,8 @@ matrix:
       gemfile: gemfiles/Gemfile.1_9_3
     - rvm: jruby-19mode
       gemfile: gemfiles/Gemfile.1_9_3
+    - rvm: 2.0.0
+      gemfile: gemfiles/Gemfile.2_0_0
     - rvm: 2.2.2
       gemfile: Gemfile
       env: PHANTOMJS=$PWD/travis-phantomjs2/phantomjs

gemfiles/Gemfile.1_9_3

@@ -10,3 +10,5 @@ platforms :rbx do
   gem 'racc'
   gem 'json'
 end
+
+gem 'nokogiri', '< 1.7.0' # 1.7.0 requires ruby 2.1+

gemfiles/Gemfile.2_0_0

@@ -0,0 +1,11 @@
+source 'https://rubygems.org'
+
+gemspec :path => '..'
+
+platforms :rbx do
+  gem 'rubysl'
+  gem 'racc'
+  gem 'json'
+end
+
+gem 'nokogiri', '< 1.7.0' # 1.7.0 requires ruby 2.1+