Added Nokogiri for testing XML

Author: TitouanVanBelle

Gemfile

@@ -3,3 +3,4 @@ source 'https://rubygems.org'
 gem 'colorize'
 gem 'thor'
 gem 'xcpretty'
+gem 'nokogiri'

Gemfile.lock

@@ -2,6 +2,9 @@ GEM
   remote: https://rubygems.org/
   specs:
     colorize (0.8.1)
+    mini_portile2 (2.3.0)
+    nokogiri (1.8.5)
+      mini_portile2 (~> 2.3.0)
     rouge (2.0.7)
     thor (0.20.0)
     xcpretty (0.2.8)
@@ -12,8 +15,9 @@ PLATFORMS
 
 DEPENDENCIES
   colorize
+  nokogiri
   thor
   xcpretty
 
 BUNDLED WITH
-   1.16.4
+   1.16.6