bump version to 1.5rc2
bump version to 1.5rc2

nthall/pip,ncoghlan/pip,rouge8/pip,harrisonfeng/pip,mindw/pip,wkeyword/pip,erikrose/pip,zvezdan/pip,davidovich/pip,zenlambda/pip,jasonkying/pip,pradyunsg/pip,mujiansu/pip,erikrose/pip,James-Firth/pip,sbidoul/pip,chaoallsome/pip,squidsoup/pip,willingc/pip,xavfernandez/pip,msabramo/pip,wkeyword/pip,chaoallsome/pip,haridsv/pip,Ivoz/pip,Gabriel439/pip,sigmavirus24/pip,natefoo/pip,fiber-space/pip,zvezdan/pip,xavfernandez/pip,squidsoup/pip,dstufft/pip,h4ck3rm1k3/pip,esc/pip,habnabit/pip,h4ck3rm1k3/pip,RonnyPfannschmidt/pip,jamezpolley/pip,jmagnusson/pip,habnabit/pip,esc/pip,pjdelport/pip,techtonik/pip,yati-sagade/pip,caosmo/pip,dstufft/pip,mattrobenolt/pip,zenlambda/pip,pfmoore/pip,haridsv/pip,mindw/pip,Gabriel439/pip,patricklaw/pip,h4ck3rm1k3/pip,jamezpolley/pip,patricklaw/pip,qbdsoft/pip,harrisonfeng/pip,tdsmith/pip,yati-sagade/pip,benesch/pip,qbdsoft/pip,caosmo/pip,luzfcb/pip,KarelJakubec/pip,benesch/pip,Carreau/pip,pjdelport/pip,Carreau/pip,jasonkying/pip,cjerdonek/pip,cjerdonek/pip,davidovich/pip,zenlambda/pip,squidsoup/pip,benesch/pip,jasonkying/pip,luzfcb/pip,caosmo/pip,willingc/pip,ncoghlan/pip,msabramo/pip,pradyunsg/pip,ianw/pip,chaoallsome/pip,blarghmatey/pip,graingert/pip,mindw/pip,mujiansu/pip,ianw/pip,mujiansu/pip,habnabit/pip,KarelJakubec/pip,rbtcollins/pip,zorosteven/pip,techtonik/pip,rbtcollins/pip,Ivoz/pip,luzfcb/pip,alex/pip,erikrose/pip,supriyantomaftuh/pip,atdaemon/pip,techtonik/pip,mattrobenolt/pip,willingc/pip,atdaemon/pip,sigmavirus24/pip,harrisonfeng/pip,Gabriel439/pip,minrk/pip,alex/pip,KarelJakubec/pip,pypa/pip,supriyantomaftuh/pip,rbtcollins/pip,prasaianooz/pip,ncoghlan/pip,dstufft/pip,atdaemon/pip,tdsmith/pip,davidovich/pip,rouge8/pip,ChristopherHogan/pip,prasaianooz/pip,pjdelport/pip,nthall/pip,wkeyword/pip,jythontools/pip,yati-sagade/pip,graingert/pip,blarghmatey/pip,minrk/pip,supriyantomaftuh/pip,zorosteven/pip,haridsv/pip,graingert/pip,qbdsoft/pip,blarghmatey/pip,esc/pip,jmagnusson/pip,rouge8/pip,sigmavirus24/pip,natefoo/pip,James-Firth/pip,jmagnusson/pip,pypa/pip,sbidoul/pip,tdsmith/pip,alex/pip,jamezpolley/pip,fiber-space/pip,pfmoore/pip,xavfernandez/pip,nthall/pip,RonnyPfannschmidt/pip,RonnyPfannschmidt/pip,zorosteven/pip,ChristopherHogan/pip,zvezdan/pip,natefoo/pip,fiber-space/pip,jythontools/pip,jythontools/pip,prasaianooz/pip,James-Firth/pip,ChristopherHogan/pip