Resolve more linter warnings

src/mtcipher.rs

@@ -11,7 +11,7 @@ pub fn encrypt(key: u16, Bytes(data): &Bytes) -> Bytes {
     // Write the function that does this for MT19937 using a 16-bit seed.
 
     let mut mt = mt19937::MT19937::new();
-    mt.seed(key as u32);
+    mt.seed(key.into());
     let mut result: Vec<u8> = vec![];
 
     for chunk in data.chunks(4) {