TST: fix link to Rackspace wheelhouse, so Appveyor can grab Cython wheels.
TST: fix link to Rackspace wheelhouse, so Appveyor can grab Cython wheels.

michelp/pywt,eriol/pywt,michelp/pywt,kwohlfahrt/pywt,aaren/pywt,rgommers/pywt,rgommers/pywt,michelp/pywt,aaren/pywt,kwohlfahrt/pywt,PyWavelets/pywt,eriol/pywt,PyWavelets/pywt,ThomasA/pywt,rgommers/pywt,aaren/pywt,eriol/pywt,ThomasA/pywt,grlee77/pywt,ThomasA/pywt,grlee77/pywt,rgommers/pywt,kwohlfahrt/pywt