typo

src/tests.rs

@@ -101,7 +101,7 @@ fn test_damerau_levenshtein_strings() {
         &[
             (String::from("coal"), 1),
             (String::from("boat"), 1),
-            (String::from("caos"), 3),
+            (String::from("caos"), 2),
             (String::from("camel"), 4),
             (String::from("copper"), 4),
             (String::from("ship"), 4),