Merge pull request #907 from SethTisue/nokogiri-security

upgrade nokogiri, because security

Author: SethTisue

Gemfile.lock

@@ -20,7 +20,7 @@ GEM
       addressable (~> 2.3)
       colorize (~> 0.8)
       mercenary (~> 0.3.2)
-      nokogiri (~> 1.8.1)
+      nokogiri (~> 1.8.2)
       parallel (~> 1.3)
       typhoeus (~> 1.3)
       yell (~> 2.0)