Fixed a bug that caused an error when activating the plugin if the PHP version is old

【Details of the fix】
■Fixed a bug that caused an error when activating plug-ins if the PHP version installed on the server is older than 5.x.

The following are the files that have been modified for this update.
【Corrected files】
plugins/tcd-workflow/design-plus-contact-form.php
plugins/tcd-workflow/readme.txt

For more information, please visit the download site for purchasers of AGENT (tcd033).

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