Update function make_confusion_metrix to have vertical xticklables

[jaypat7828]

Thank you much for guiding through the Tensorflow course very systematically. I have learned a good deal.

I found the 'make_confusion_matrix' function very useful.

here is the scenario:

`y_true = ["countryman rambo", "neighboring man jumbo", "countryman rambo", "countryman rambo", "neighboring man jumbo", "birdman", "superman", "logicalman"]
y_pred = ["neighboring man jumbo", "neighboring man jumbo", "countryman rambo", "countryman rambo", "neighboring man jumbo", "countryman rambo", "superman", "logicalman"]
labels = ["countryman rambo", "neighboring man jumbo", "birdman", "superman", "logicalman"]

make_confusion_matrix_old(
y_true,
y_pred,
labels,
figsize=(8, 8),
)`

when the confusion matrix comes out nicely but the Xlabes needs some help.

I have updated the code and here is the new version.

Thanks,

Jaydip