Update click-events.md

Author: michaelbabyn

python/click-events.md

@@ -39,7 +39,7 @@ jupyter:
 
 #### Update Points Using a Click Callback
 
-```
+```python
 import plotly.graph_objects as go
 
 import numpy as np
@@ -85,4 +85,4 @@ See [these Jupyter notebooks](https://github.com/jonmmease/plotly_ipywidget_note
 import plotly.graph_objects as go
 f = go.FigureWidget([go.Scatter()])
 help(f.data[0].on_click)
-```
+```