readded cast_lossless supress to encode

beacon_chain/utils/ssz/src/impl_encode.rs

@@ -1,5 +1,3 @@
-#![cfg_attr(not(feature = "clippy"), allow(cast_lossless))]
-
 extern crate bytes;
 
 use super::{
@@ -17,8 +15,8 @@ use self::bytes::{ BytesMut, BufMut };
 macro_rules! impl_encodable_for_uint {
     ($type: ident, $bit_size: expr) => {
         impl Encodable for $type {
-            fn ssz_append(&self, s: &mut SszStream)
-            {
+            #[allow(cast_lossless)]
+            fn ssz_append(&self, s: &mut SszStream) {
                 // Ensure bit size is valid
                 assert!((0 < $bit_size) &&
                         ($bit_size % 8 == 0) &&