BLD: remove duplicate pip install of matplotlib
BLD: remove duplicate pip install of matplotlib

pip install numpydoc too

grlee77/pywt,grlee77/pywt,michelp/pywt,michelp/pywt,rgommers/pywt,eriol/pywt,PyWavelets/pywt,rgommers/pywt,michelp/pywt,rgommers/pywt,eriol/pywt,eriol/pywt,PyWavelets/pywt,rgommers/pywt