Typo in Notebook link

[dsantiago]

Hello your README have a typo on the notebook link:

See demo jupyter notebook complete example: https://github.com/akarazniewicz/smd/blob/master/demo/demo.jpnby

But the right link is: https://github.com/akarazniewicz/smd/blob/master/demo/demo.ipynb

[codexponent]

#6