Update app.py

app.py

@@ -25,6 +25,7 @@ colors = {'not started': 'rgb(220, 0, 0)',
 fig = ff.create_gantt(df, colors=colors, index_col='Resource', show_colorbar=True, title="BigCode planning")
 fig.update_xaxes(ticks= "outside",
                  ticklabelmode= "period", 
+                 tickformat="%m",
                  tickcolor= "black", 
                  ticklen=10, 
                  minor=dict(