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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NULL (BIZ002) QUADRA (BIZ001) Muum (TCD085) MASSIVE（TCD084） ANTHEM（TCD083） CURE（TCD082） Tree（TCD081） HAKU（TCD080） EGO.（TCD079）for WooCommerce EGO.（TCD079）for Welcart FORCE(TCD078) HEAL (TCD077) Be (TCD076) EVERY （TCD075） FAKE（TCD074） GLAMOUR（TCD073） NOEL（TCD072） MIKADO (TCD071) NUMERO（TCD070） TOKI(TCD069) ROCK(TCD068) ZOOMY（TCD067） DIVA(TCD066) NANO(TCD065) FAMOUS (TCD064) Switch (TCD063) ICONIC(TCD062) ONE (TCD061) AVANT（TCD060） AGENDA (TCD059) RUMBLE(TCD058) BIRTH（TCD057） KADAN (TCD056) ZERO (TCD055) BEAUTY(TCD054) Bloom（TCD053） STYLY (TCD052) VOGUE (TCD051) GENSEN(TCD050) BRIDGE（tcd049） OOPS!（TCD048） ANGEL（TCD047） SKIN（TCD046） SOURCE (TCD045) UNIQUE (TCD044) MAXX (TCD043) MONOLITH (TCD042) STORY (TCD041) Avalon (TCD040) LOTUS (TCD039) VENUS (TCD038) ORION (TCD037) MAG (TCD036) BLOC (TCD035) IZM (TCD034) AGENT (TCD033) VIEW (TCD032) LAW (TCD031) FOCUS (TCD030) SWEETY (TCD029) AMORE (TCD028) CORE (TCD027) Reviewer (TCD026) INNOVATE HACK (TCD025) PHOTEK (TCD024) CUBEY (TCD023) LUXE (TCD022) NEXTAGE (TCD021) Logue (TCD020) Precious (TCD019) Opinion (TCD018) Canvas (TCD017) Chill (TCD016) Grider (TCD015) AN (TCD014) Gorgeous (TCD013) TCD Google Maps TCD Workflow Common