Can not install basemap via pip anymore

[yuvipanda]

Due to matplotlib/basemap#251, pip can no longer install basemap like it is specified in requirements.txt

[jakevdp]

Ok - thanks for letting me know. I'd suggest installing via conda - that should still work.

[fbs82]

On Windows the standard basemap package doesn't work with Python 3. One can use the conda-forge version instead: https://anaconda.org/conda-forge/basemap

[johanovic]

Could the notebooks run without basemap? Many people don't use conda, but use pip and venvs only. Thanks

[jakevdp]

Only one of the notebooks uses basemap. I think it might be best to just remove the requirement because of all the trouble it's causing.

[jakevdp]

Basemap is no longer in requirements: 475499f

[yuvipanda]

This makes the repo work with beta binder now:

https://beta.mybinder.org/v2/gh/jakevdp/PythonDataScienceHandbook/master

Thanks for the fix!