Fix multiple function calls in Chapter 5

[mfruhner]

Hello,

there are currently two problems with the README of 5.1:

df.corr
The default value of df.corr()'s numeric_only parameter changed to False in 2.0.
Therefore the code in the notebook throws an error when executed.
I set the parameter back to True, which fixes the notebook.

sns.FacetGrid
The name of the size parameter has changed to height.
I fixed that as well.

There is also a change in the handling of sns color palettes, where you now have to assign the hue parameter to x, but I did not include that change, yet. Let me know, if you would like me to add it.

In the README of 5.2, the sns.lineplot function does not accept 2 positional arguments (anymore). I named them x and y accordingly.

Best regards,
Maik

[mfruhner]

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