Fix the bug by which calling to_hash() twice breaks .
Checking in changes prior to tagging of version 0.03.

Changelog diff is:

diff --git a/Changes b/Changes
index 451781e..0333c11 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,9 @@
 Revision history for Perl extension Class::Accessor::TrackDirty

+0.03 March 29, 2013
+    - Fix the bug by which to_hash() may break $self again.
+      Don't use Class::Accessor::TrackDirty-0.02.
+
 0.02 March 29, 2013
     - Fix the bug by which to_hash() may break $self.