Remove Instant, Duration, Ordinal.

We're going to totally change how this works, so remove
things that we don't support yet anyway.

src/matchers/mod.rs

@@ -15,28 +15,21 @@
 //! ...
 
 use language_tags::LanguageTag;
-use std::time::{Duration, Instant};
 
 pub mod english;
 
 #[allow(missing_docs)]
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
 pub enum ValueType {
     Boolean,
-    Duration,
-    Instant,
     Integer,
-    Ordinal,
 }
 
 #[allow(missing_docs)]
 #[derive(Debug, PartialEq)]
 pub enum HumanValue {
     Boolean(bool),
-    Duration(Duration),
-    Instant(Instant),
     Integer(i64),
-    Ordinal(i64),
 }
 
 #[allow(missing_docs)]