Updated to latest patched Nokogiri

Author: abartov

docx.gemspec

@@ -12,7 +12,7 @@ Gem::Specification.new do |s|
   s.homepage    = 'https://github.com/chrahunt/docx'
   s.files       = Dir["README.md", "LICENSE.md", "lib/**/*.rb"]
 
-  s.add_dependency 'nokogiri', '> 1.8', '>= 1.8.1'
+  s.add_dependency 'nokogiri', '>= 1.10.4'
   s.add_dependency 'rubyzip',  '~> 1.2', '>= 1.2.1'
 
   s.add_development_dependency 'rspec', '~> 3.7'