Maria Kovaleva d7de908a82 Fix countdown.py returning None (#94) ...

The original code does not return the value in the if-clause and the return statement in the else-clause, which led to the function returning None at the end of the countdown (5, 4, 3, 2, 1, 0, None).

2018-12-28 08:25:48 -08:00

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