Data Structures readme update with Bite promo code alternative

Author: Julian Sequeira

days/07-09-data-structures/README.md

@@ -25,6 +25,8 @@ Follow the instructions on page once you've redeemed the Bite and see if you can
 
 ## Day N+2: Your Turn!
 
+**UPDATE: We decided to wrap the below (and a little more) into a Bite on the CodeChalleng.es Platform for you. You're still more than welcome to perform the work as per the below but if you want to try this in a Bite then [click here](https://codechalleng.es/bites/promo/listvsdict) to redeem the Bite for free.
+
 Create a script that imports the US States data structures contained in the following script file in our Repo: [https://github.com/talkpython/100daysofcode-with-python-course/blob/master/days/07-09-data-structures/code/data.py](https://github.com/talkpython/100daysofcode-with-python-course/blob/master/days/07-09-data-structures/code/data.py) 
 
 Perform the following tasks on the list and dict. The less you look at them, the better this exercise will be. Remember: **Dicts are unsorted**.