Update Readme.md another useful link

journal/Readme.md

@@ -29,6 +29,7 @@ I don't know why I can't sign in when I am in the course Gitlab, so this are the
     - When you want a continuous vector: `np.linspace` (not the case for Exercise 2)
     - When you want a discrete vector (start, stop, step): `np.arange`
 - [Matplotlib memo](https://matplotlib.org/stable/api/pyplot_summary.html)
+- [Pandas functions](https://pandas.pydata.org/docs/reference/api/pandas.DataFrame.dropna.html)
 
 # Regarding exercise 3.2
 Along with my teammate I tried doing this part but we weren't successful. We will ask the professor on tomorrow's concluding session.