Bite 139. Calculate a coding streak in days

In this Bite you are going to calculate the amount of days you are on a coding streak (consecutive days coded. You are presented with this DB table like output of date/activity/count:

data = """
    +------------+------------+---------+
    | date       | activity   | count   |
    |------------+------------+---------|
    | 2018-11-11 | pcc        | 1       |
    | 2018-11-10 | 100d       | 1       |
    | 2018-11-09 | 100d       | 2       |
    | 2018-10-23 | pcc        | 1       |
    | 2018-10-15 | pcc        | 1       |
    | 2018-10-05 | bite       | 1       |
    | 2018-09-21 | bite       | 4       |
    | 2018-09-18 | bite       | 2       |
    | 2018-09-18 | bite       | 4       |
    +------------+------------+---------+
"""

Here is what you need to do:

• Complete extract_dates to extract date (not datetime) objects.
• Complete calculate_streak that takes those date objects and returns the streak in (int) days.
• Calculate back from TODAY that is set to date(2018, 11, 12). Note that a streak can be > 0 if today or yesterday is in the date range. This is because we don't assume today to be over yet, so if yesterday was coded that is a valid continuation of a streak. If today was coded that counts towards the streak too of course.

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