Lock nokogiri version for Ruby 1.9

nextmat · nextmat · commit 3ef2d6b6f310 · 2017-01-17T16:36:02.000-08:00
diff --git a/Gemfile b/Gemfile
@@ -21,6 +21,10 @@ gem 'mocha', require: false
 # benchmarking
 gem 'benchmark_suite'
 
+platforms :ruby_19 do
+  gem 'nokogiri', '~> 1.6.0' # 1.7+ requires ruby 2.1
+end
+
 # platforms :rbx do
 #   gem 'rubysl', '~> 2.0'
 #   gem 'racc'
