Wrote factorial function...fixed missing parentheses bug.

[sh4r11f]

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[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@0f001e7). Click here to learn what that means.
The diff coverage is 42.85%.

@@            Coverage Diff            @@
##             master       #2   +/-   ##
=========================================
  Coverage          ?   53.84%           
=========================================
  Files             ?        1           
  Lines             ?       13           
  Branches          ?        2           
=========================================
  Hits              ?        7           
  Misses            ?        4           
  Partials          ?        2

Impacted Files	Coverage Δ
factorial.py	53.84% <42.85%> (ø)

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