use the minimum supported Cython version in one of the TravisCI runs
use the minimum supported Cython version in one of the TravisCI runs

grlee77/pywt,PyWavelets/pywt,PyWavelets/pywt,rgommers/pywt,rgommers/pywt,rgommers/pywt,grlee77/pywt,rgommers/pywt