Allow len_without_is_empty to make clippy happy.

Author: MidasLamb

src/lib.rs

@@ -21,6 +21,7 @@ mod serde_support;
 #[repr(transparent)]
 pub struct NonEmptyString(String);
 
+#[allow(clippy::len_without_is_empty)] // is_empty would always returns false so it seems a bit silly to have it.
 impl NonEmptyString {
     /// Attempts to create a new NonEmptyString.
     /// If the given `string` is empty, `Err` is returned, containing the original `String`, `Ok` otherwise.