Address clippy lint

src/history/file.rs

@@ -313,6 +313,7 @@ fn trim_leading_spaces(s: &[u8]) -> (usize, &[u8]) {
     (count, &s[count..])
 }
 
+#[allow(clippy::type_complexity)]
 fn extract_prefix_and_unescape_yaml(line: &[u8]) -> Option<(Cow<[u8]>, Cow<[u8]>)> {
     let mut split = line.splitn(2, |c| *c == b':');
     let key = split.next().unwrap();