Changing return types for phone-number exercise to be Maybes #163
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Signaling invalid input to phone number parsing by returning a Nothing instead of a string of 0's. This better represents idiomatic haskell, and also signifies a difference between an input of all 0's and an invalid input. Closes exercism#158
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Signaling invalid input to phone number parsing by returning a Nothing
instead of a string of 0's. This better represents idiomatic haskell,
and also signifies a difference between an input of all 0's and an
invalid input.
Closes #158