A few amendments again to the readme.txt
A few amendments again to the readme.txt

WPTechInnovation/worldpay-within-sdk,WPTechInnovation/worldpay-within-sdk,WPTechInnovation/worldpay-within-sdk,WPTechInnovation/worldpay-within-sdk,WPTechInnovation/worldpay-within-sdk,WPTechInnovation/worldpay-within-sdk