Place phone-number exercise before nucleotide-count exercise #184
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I'm open to discussion on this, but I think that since Nucleotide Count was changed to return Either (#165) and Phone Number was changed to return Maybe (#163), it makes sense to swap the order. In introductory Haskell materials, such as LYAH,
Maybetypically comes beforeEither, and I think it makes sense because conceptually Maybe is simpler.