Merge pull request #147 from vinegar-tom/patch-4

Add ipywidgets install for plotly

Author: chennesy

episodes/data-visualisation.md

@@ -146,6 +146,10 @@ plotting package in Python called Plotly. First let’s install and then use the
 ```python
 # uncomment below to install plotly if the import fails. 
 # !pip install plotly
+
+# if you didn't install Jupyter via Anaconda, you may also need to install ipywidgets.
+# !pip install ipywidgets
+
 import plotly.express as px
 ```