Convert from try!() macro to ? operator
#18
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See https://doc.rust-lang.org/std/macro.try.html for context. The `try!()` macro was replaced by the more succinct `?` operator.
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See https://doc.rust-lang.org/std/macro.try.html for context. The
try!()macro was replaced by the more succinct?operator.This represents a step toward matching modern Rust style and fixing issues enumerated in #16