Updating Nokogiri to address vulnerability

Author: nadamsoreilly

Gemfile.lock

@@ -9,7 +9,11 @@ GEM
   remote: https://rubygems.org/
   specs:
     diff-lcs (1.2.4)
-    nokogiri (1.5.10)
+    mini_portile2 (2.8.0)
+    nokogiri (1.13.7)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
+    racc (1.6.0)
     rspec (2.14.1)
       rspec-core (~> 2.14.0)
       rspec-expectations (~> 2.14.0)