Update tutorial_bias_advertising.ipynb

[msdokania]

Addresses 1/3rd of #389

[anupamamurthi]

Hi @msdokania

I see that you have added a badge but I am unable to run the notebook.

I see two issues

1. You will need to pip install aif360 as part of the notebook

Install AIF360 !pip install 'aif360'

2. you will also need "ad_campaign_data.csv" to be downloaded as part of the notebook. I would recommend using a wget or use python's request module to grab bias-in-advertising.tar.gz
3. Finally, u will still need code to unarchive the above file to obtain ad_campaign_data.csv