swanson / stringer / 625

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Fix Performance/StringReplacement

> ### delete([other_str]+) -> new_str
>
> Returns a copy of *str* with all characters in the intersection of its
> arguments deleted. Uses the same rules for building the set of characters as
> `String#count`.

See <http://ruby-doc.org/core-2.0.0/String.html#method-i-delete>.

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