Remove the num-derive dependency

Cargo.toml

@@ -19,7 +19,6 @@ exclude = ["tests/images/*", "tests/fuzz_images/*"]
 [dependencies]
 byteorder = "1.2"
 lzw = "0.10"
-num-derive = "0.3"
 num-traits = "0.2"
 miniz_oxide = "0.3"
 

src/lib.rs

@@ -9,8 +9,6 @@
 extern crate byteorder;
 extern crate lzw;
 extern crate miniz_oxide;
-#[macro_use]
-extern crate num_derive;
 extern crate num_traits;
 
 pub mod decoder;