Update README.md

README.md

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 ### Datasets used in the article "Deep learning of contagion dynamics on complex networks"
 
-This repository contains the raw and processed datasets as well as the [notebook]() used to generate the latter.
+This repository contains the raw and processed datasets as well as the [notebook](covid-data-processing.ipynb) used to generate the latter.
 
 
 #### Number of cases