Break out version extraction for reuse.
Break out version extraction for reuse.

This is needed for determining the wheel-cachability of a requirement.

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