refactor(parser): remove lint warning related to 'try' usage

[jayaddison]

This change eliminates a compile-time lint warning; the indicated try! macro is removed, and an ? operator is introduced instead.

warning: use of deprecated item 'try': use the `?` operator instead
   --> src/parser.rs:179:29
    |
179 |         let parse_key_res = try!(parse_key(key));

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