add a db update script to update the Messages column to a TEXT type.

db/zm_update-1.30.1.sql

@@ -0,0 +1,7 @@
+--
+-- This updates a 1.30.0 database to 1.30.1
+--
+-- Alter type of Messages column from VARCHAR(255) to TEXT
+--
+
+ALTER TABLE Logs MODIFY Message TEXT;