Fix instructions for installing development version. Fixes GH-287; thanks Chris Jerdonek for the report.
Fix instructions for installing development version. Fixes GH-287; thanks Chris Jerdonek for the report.

ionelmc/virtualenv,kissthink/virtualenv,Lyleo/virtualenv,bigplus/virtualenv,haridsv/virtualenv,mykemunson/virtualenv,francatore/virtualenv,Ivoz/virtualenv,RAS-ViVa/virtualenv,dstufft/virtualenv,ionelmc/virtualenv,jedie/virtualenv,Lyleo/virtualenv,madprog/virtualenv,Seha16/virtualenv,davidszotten/virtualenv,RAS-ViVa/virtualenv,dstufft/virtualenv,jedie/virtualenv,vvtam/virtualenv,ionelmc/virtualenv,mykemunson/virtualenv,blueyed/virtualenv,techtonik/virtualenv,davidszotten/virtualenv,francatore/virtualenv,vvtam/virtualenv,blueyed/virtualenv,haridsv/virtualenv,techtonik/virtualenv,bigplus/virtualenv,Ivoz/virtualenv,Seha16/virtualenv,madprog/virtualenv,kissthink/virtualenv