TST: remove test for deprecation warning that fails on TravisCI.
TST: remove test for deprecation warning that fails on TravisCI.

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