Draws Labels inside the circles #8
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This PR enables to write the labels inside the circles instead of below.
This is especially useful when a user needs to draw different numbers, such as the example below:
Before:

After:

Note that this can be used to write inside the circles labels like "A", "B" or "C", thus giving a bit more flexibility to the library.
Let me know if you don't like something and I'll fix it or if something isn't clear.
Thanks a lot.