Gemfile in plurimath-0.2.1 vs Gemfile in plurimath-0.2.2

@@ -4,5 +4,7 @@
 gemspec
 
 gem "rake", "~> 12.0"
 gem "rspec", "~> 3.0"
 gem 'simplecov', require: false, group: :test
+gem 'htmlentities'
+gem 'equivalent-xml'