Rename `plt.cm.spectral` to `plt.cm.nipy_spectral` #404

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GaelVaroquaux merged 1 commit intoscipy-lectures:masterfrom

Oct 27, 2018

Commits on Oct 27, 2018

Rename `plt.cm.spectral` to `plt.cm.nipy_spectral` to make it work with matplotlib>=2.2
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