Fix tests

src/pack.rs

@@ -227,7 +227,6 @@ mod test {
     use parity_wasm::builder;
     use super::*;
     use super::super::optimize;
-    use byteorder::{ByteOrder, LittleEndian};
 
     fn test_packer(mut module: elements::Module) {
         let mut ctor_module = module.clone();