california_cities.csv missing in notebooks/data/

[thozimm]

The following lines from the book result in "404 not found"

url = ('https://raw.githubusercontent.com/jakevdp/PythonDataScienceHandbook/' 'master/notebooks/data/california_cities.csv') !cd data && curl -O {url}

[lashvarda]

I've added the missing california_cities.csv and opened a pull request to fix this. Hope this helps!