Force re-validiton of nokogiri html doc aftere ignored tags removal.

lib/html/proofer/check_runner.rb

@@ -1,5 +1,7 @@
 # encoding: utf-8
 
+require_relative './utils'
+
 module HTML
   class Proofer
     # Mostly handles issue management and collecting of external URLs.
@@ -53,7 +55,11 @@ def self.checks
 
       def remove_ignored(html)
         html.css('code, pre, svg').each(&:unlink)
-        html
+        # We have to create a new document here otherwise we would still
+        # see errors because they get generated immediately after document
+        # is loaded so we have to re-validate the document after removing
+        # ignored tags.
+        HTML::Utils.create_nokogiri(html.to_s)
       end
     end
   end