bigint upgraded to version 3.0 (#5986)

* bigint upgraded to version 3.0

* fixed missing FromHex import in ethcore tests

* fixed missing FromHex import in rpc tests

hw/Cargo.toml

@@ -15,4 +15,4 @@ ethkey = { path = "../ethkey" }
 ethcore-bigint = { path = "../util/bigint" }
 
 [dev-dependencies]
-rustc-serialize = "0.3"
+rustc-hex = "1.0"

hw/src/ledger.rs

@@ -340,7 +340,7 @@ impl Manager {
 
 #[test]
 fn smoke() {
-	use rustc_serialize::hex::FromHex;
+	use rustc_hex::FromHex;
 	let mut manager = Manager::new().unwrap();
 	manager.update_devices().unwrap();
 	for d in &manager.devices {

hw/src/lib.rs

@@ -22,7 +22,7 @@ extern crate libusb;
 extern crate ethkey;
 extern crate ethcore_bigint as bigint;
 #[macro_use] extern crate log;
-#[cfg(test)] extern crate rustc_serialize;
+#[cfg(test)] extern crate rustc_hex;
 
 mod ledger;