adjust php dependancy to 5.2.0
adjust php dependancy to 5.2.0

jahanzaibbahadur/phpfreechat,bright-sparks/phpfreechat,MingJen/phpfreechat,bright-sparks/phpfreechat,bright-sparks/phpfreechat,kerphi/phpfreechat,MingJen/phpfreechat,MingJen/phpfreechat,kerphi/phpfreechat,jahanzaibbahadur/phpfreechat,jahanzaibbahadur/phpfreechat