twspider.py Minor Correction

[zjfelling]

There is a minor inconsistency with how the twspider.py code is presented in chapter 15.

" url = twurl.augment(TWITTER_URL, {'screen_name': acct, 'count': '5'})
print('Retrieving', url) " is used early in the section showing the intent to retrieve a count of 5
friends.

However, later in the section, examples showing the code running have the script retrieving 20 accounts per search without any explanation for this change.

[csev]

Thanks.