fix(api): remove obsolete type

Author: zkat

Diff for: src/error.rs

@@ -82,14 +82,6 @@ pub enum KdlErrorKind {
     Other,
 }
 
-/// Coversion errors for converting [`KdlNode`] to another type via [`TryFrom`] or [`TryInto`].
-#[derive(Debug, Clone, Eq, PartialEq, Error)]
-#[error("Failed to convert from KdlNodeValue::{variant} to {expected}.")]
-pub struct TryFromKdlNodeValueError {
-    pub(crate) expected: &'static str,
-    pub(crate) variant: &'static str,
-}
-
 #[derive(Debug, Clone, Eq, PartialEq)]
 pub(crate) struct KdlParseError<I> {
     pub(crate) input: I,