Requirements.txt - adding matplotlib.pyplot to the list crashes my app

I am trying to display seaborn chart in my app.
In order to do this I should use matplotlib.pyplot. But when I try to add it to my requirements, my app crashes.
What can be the reason?
Or maybe you know workaround to display seaborn graph?

Please share a link to your public github repo for further assistance.
In short, add this to your requirements.txt file: