Fix borken log message.
Fix borken log message.

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