MySQL's TEXT type limited only 65535 byte. So change sql_text columns definition to LONGTEXT.
Checking in changes prior to tagging of version 0.07.

Changelog diff is:

diff --git a/Changes b/Changes
index 1de4798..f000cfb 100644
--- a/Changes
+++ b/Changes
@@ -1,6 +1,8 @@
 Revision history for Perl extension GitDDL-Migrator

 {{$NEXT}}
+
+0.07 2014-04-06T11:26:37Z
     - MySQL's TEXT type limited only 65535 byte. So change sql_text columns definition to LONGTEXT.

 0.06 2013-12-19T07:05:00Z