Typo in example script README.md

[marie-cloet2000]

At line 84 in the README.md, there is written

cont_f1 = axes[0].contourf(X, Y, phi.get().reshape(X.shape))

However, phi is a numpy.ndarray type and hence does not support the method get() (which is probably from dataframes?).

I could resolve this by omitting the get(), such that the line reads now

cont_f1 = axes[0].contourf(X, Y, phi.reshape(X.shape))

This reproduces the example successfully.