BLD: fix path to refguide_check.py in Travis script
BLD: fix path to refguide_check.py in Travis script

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