Fix tests

build/Cargo.toml

@@ -17,3 +17,6 @@ pwasm-utils = { path = ".." }
 pwasm-utils-logger = { path = "../logger" }
 glob = "0.2"
 clap = "2.24"
+
+[dev-dependencies]
+tempdir = "0.3"

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();