Fix getPort() following psr-7 spec
Fix getPort() following psr-7 spec

JoeBengalen/Slim,mnapoli/Slim,iinux/Slim,AndrewCarterUK/Slim,jaapverloop/Slim,feryardiant/slim,akrabat/Slim,dopesong/Slim,Sam-Burns/Slim,designermonkey/Slim,somjit2514/basic,iinux/Slim,samsonasik/Slim,foxyantho/Slim,iinux/Slim,juliangut/Slim,RealSelf/Slim,opengeek/Slim,slimphp/Slim