Resolve redundant_field_names clippy lint from PR 51

    warning: redundant field names in struct initialization
       --> src/bytebuf.rs:136:19
        |
    136 |         ByteBuf { bytes: bytes }
        |                   ^^^^^^^^^^^^ help: replace it with: `bytes`
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
        = note: `-W clippy::redundant-field-names` implied by `-W clippy::all`
        = help: to override `-W clippy::all` add `#[allow(clippy::redundant_field_names)]`

src/bytebuf.rs

@@ -133,7 +133,7 @@ impl BorrowMut<Bytes> for ByteBuf {
 
 impl From<Vec<u8>> for ByteBuf {
     fn from(bytes: Vec<u8>) -> Self {
-        ByteBuf { bytes: bytes }
+        ByteBuf { bytes }
     }
 }