#179 importing alt directly rather than from app.py

Author: PJ Hoberman

src/tests/test_app.py

@@ -3,10 +3,10 @@
 import pytest  # type: ignore
 import pandas as pd  # type: ignore
 import numpy as np  # type: ignore
-import altair as alt
+import altair as alt # type: ignore
 
 from penn_chime.charts import new_admissions_chart, admitted_patients_chart
-from penn_chime.models import sir, sim_sir, sim_sir_df
+from penn_chime.models import sir, sim_sir
 from penn_chime.parameters import Parameters
 from penn_chime.presentation import display_header
 from penn_chime.settings import DEFAULTS