Jake Waksbaum d84de004c8
Replace impl_enum with strum::{EnumString,Display}
Replace the impl_enum! macro, which automatically derives instances of
std::fmt::Display and std::string::FromStr, with derive macros from the
strum crate (Display and EnumString resp.).

Closes #90.
2020-05-29 10:59:33 -04:00
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