stop escaping here since nokogiri does it, and update the regexp to match utf-8

Author: jakedouglas

lib/html/pipeline/toc_filter.rb

@@ -11,9 +11,8 @@ def call
         headers = Hash.new(0)
         doc.css('h1, h2, h3, h4, h5, h6').each do |node|
           name = node.text.downcase
-          name.gsub!(/[^\w\- ]/, '') # remove punctuation
+          name.gsub!(/[^\p{Word}\- ]/u, '') # remove punctuation
           name.gsub!(' ', '-') # replace spaces with dash
-          name = EscapeUtils.escape_uri(name) # escape extended UTF-8 chars
 
           uniq = (headers[name] > 0) ? "-#{headers[name]}" : ''
           headers[name] += 1
@@ -25,4 +24,4 @@ def call
       end
     end
   end
-end
+end