Update the examples on the README

[alicescfernandes]

Hi!
The documentation is outdated, leading users of this lib into error. One example of this is the documentation regarding the text color. Following this example on README, the color of the label doesn't change, but the example given on this issue actually works. The fontColor property doesn't even appear on the README, and only on that issue.

I believe that the docs are outdated, and could be updated.