Update README for 1.5.0 release
Update README for 1.5.0 release

arronmabrey/rack,davydovanton/rack,tricknotes/rack,ngpestelos/rack,trexnix/rack,gfvcastro/rack,tylergannon/rack,Codeman655/rack,wildjcrt/rack,ngpestelos/rack,nmk/rack,eavgerinos/rack,ganmacs/rack,zjsxwc/rack,deepj/rack,sigmavirus24/rack,AMekss/rack,keithduncan/rack,gfvcastro/rack,akihiro17/rack,imtayadeway/rack,chneukirchen/rack,eavgerinos/rack,stepri/rack,shaneog/rack,supzann3/rack,davidcelis/rack,trexnix/rack,laplaceliu/rack,sigmavirus24/rack,ganmacs/rack,sigmavirus24/rack,maclover7/rack,Eric-Guo/rack,Comcast/rack,Eric-Guo/rack,eavgerinos/rack,keepcosmos/rack,liamseanbrady/rack,keithduncan/rack,fabianrbz/rack,arronmabrey/rack,gioele/rack,wjordan/rack,eins78/rack,tylergannon/rack,shaneog/rack,Codeman655/rack,ganmacs/rack,deepj/rack,gfvcastro/rack,Codeman655/rack,rwz/rack,shaneog/rack,imtayadeway/rack,akihiro17/rack,ktheory/rack,keithduncan/rack,wildjcrt/rack,stepri/rack,fabianrbz/rack,chneukirchen/rack,davydovanton/rack,jeremyf/rack,trexnix/rack,ngpestelos/rack,nmk/rack,liamseanbrady/rack,deepj/rack,arronmabrey/rack,jeremyf/rack,nmk/rack,rwz/rack,tricknotes/rack,zjsxwc/rack,evanphx/rack,jackxxu/rack,evanphx/rack,ktheory/rack,Comcast/rack,davidcelis/rack,wjordan/rack,jackxxu/rack,laplaceliu/rack,tylergannon/rack,krainboltgreene/lack,liamseanbrady/rack,davydovanton/rack,laplaceliu/rack,davidcelis/rack,Comcast/rack,supzann3/rack,wildjcrt/rack,stepri/rack,AMekss/rack,Eric-Guo/rack,gioele/rack,AMekss/rack,maclover7/rack,gioele/rack,imtayadeway/rack,evanphx/rack,maclover7/rack,jeremyf/rack,wjordan/rack,supzann3/rack,rwz/rack,keepcosmos/rack,akihiro17/rack,fabianrbz/rack,zjsxwc/rack,eins78/rack,jackxxu/rack,keepcosmos/rack,chneukirchen/rack,eins78/rack