Example code in readme not matching example/example.py

[AndreiMiculita]

In the readme, you have

https://github.com/rileypsmith/sklearn-som/blob/29bab2b469086f96749fcdc09951e5da22de872b/README.md?plain=1#L19

while in example/example.py, you have https://github.com/rileypsmith/sklearn-som/blob/29bab2b469086f96749fcdc09951e5da22de872b/example/example.py#L19