Nokogiri deprecation warning

Author: ahorek

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+### Bug fixes
+
+- Passing a Nokogiri::XML::Node as the second parameter to Node.new is deprecated [#121](https://github.com/ruby-docx/docx/pull/121)
+
 ## v0.6.2
 
 ### Bug fixes

lib/docx/elements/element.rb

@@ -91,7 +91,7 @@ def html_tag(name, options = {})
       module ClassMethods
         def create_with(element)
           # Need to somehow get the xml document accessible here by default, but this is alright in the interim
-          self.new(Nokogiri::XML::Node.new("w:#{self.tag}", element.node))
+          self.new(Nokogiri::XML::Node.new("w:#{self.tag}", element.node.document))
         end
 
         def create_within(element)