Update changes.txt for new release
Update changes.txt for new release

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