[BUG] Failure to render graphs in projections_br.py

Describe the bug When running the file projections_br.py with streamlit, an error occurs saying AttributeError: 'DataFrame' object has no attribute 'get_figure' Perhaps some compatibility error with Pandas plotting feature?

To Reproduce Steps to reproduce the behavior:

1. Go to pydemic_ui directory root;
2. execute the command: streamlit run pydemic_ui/apps/app_menu.py
3. Select option "Brazil Epidemic projections and forecast"
4. Scroll down and see the error:

Expected behavior It is expected to show all available graphs and information without errors.

Desktop (please complete the following information):

• OS: Linux Mint 19.3 Tricia
• Browser Mozilla Firefox 75.0 (64-bits)

Additional context Apparently the problem is caused by these lines of code: