Fixed colorbar positioning with tight layout

[lukasmu]

This should fix #4.
The issue seems to be that plt.tight_layout() and fig.subplots_adjust() do not work well with each other.

I have to admit it's not the most beautiful code, but it seems to work fine.

Resulting in:

Instead of:

[sonarqubecloud]

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[tomkwok]

Thanks for the suggestion. Do you use Windows or Linux? I am looking for a way to produce correctly aligned/padded plots on all platforms without resorting to using OS detection hacks. With your patch applied the plots generated on macOS would not be correctly positioned.

[lukasmu]

Oh weird, I didn't know that there are such differences between OSes.
I used Ubuntu for this.

[sonarqubecloud]

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