parallel-letter-frequency: Use &str with lifetime, not String#239

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petertseng wants to merge 2 commits intoexercism:masterfrom

petertseng:plf-lifetime

Commits on Jan 4, 2017

parallel-letter-frequency: Use &str with lifetime, not String
petertseng
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Commits on Jan 5, 2017

DO NOT MERGE: This fails to compile
petertseng
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