Remove SourceLocation.

We aren't going to deal with longer texts for now, just convert
the input to a possible value as a whole.

src/parse/english/boolean.rs

@@ -19,11 +19,10 @@ pub fn register(parser: &mut Parser) {
         language: langtag!(en),
         result_type: ValueType::Boolean,
         matcher: Box::new(move |_text: &str| -> Option<Match> {
-            return Some(Match {
-                location: SourceLocation { start: 0, end: 0 },
-                weight: 100,
+            Some(Match {
                 value: HumanValue::Boolean(true),
-            });
+                weight: 100,
+            })
         }),
     });
 }

src/parse/mod.rs

@@ -60,16 +60,6 @@ use std::time::{Duration, Instant};
 
 pub mod english;
 
-/// A location within a body of text.
-#[derive(Debug)]
-pub struct SourceLocation {
-    /// The starting offset into the text of the match.
-    pub start: usize,
-
-    /// The ending offset into the text of the match.
-    pub end: usize,
-}
-
 #[allow(missing_docs)]
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
 pub enum ValueType {
@@ -109,9 +99,6 @@ pub struct Match {
     /// Should it be an enum with values like 'Likely', 'Unlikely',
     /// and 'Certain'?
     pub weight: i32,
-
-    /// Location of the match within the text.
-    pub location: SourceLocation,
 }
 
 #[allow(missing_docs)]