Checking in changes prior to tagging of version 0.19.

Changelog diff is:

diff --git a/Changes b/Changes
index 6e16577..9f40f79 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,12 @@ Revision history for Perl extension HTML::TreeBuilder::LibXML

 {{$NEXT}}

+0.19 2013-05-10T01:03:58Z
+
+    - fixed replace_with() and parent(),
+      to avoid calling appendChild() on a Document node, which is not supported by XML::LibXML.
+      (cafe01)
+
 0.18 2013-05-09T20:49:04Z

     - implemented all node methods needed for Web::Query::LibXML to work