Migrate to Rust edition 2018 + fix some clippy warnings #29
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Migrated the code to edition to 2018. Changes include:
try!(abc)
-->abc?
Box<X>
-->Box<dyn X>
use something_from_crate::ABC
-->use crate::something_from_crate::ABC
&String
-->&str
ABC { x: x}
-->ABC { x}
Edit: I'm not sure if this necessitates a version bump, but this isn't actually changing any functionality