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

dapps/src/apps/fetcher/mod.rs

@@ -23,7 +23,7 @@ mod installers;
 use std::{fs, env};
 use std::path::PathBuf;
 use std::sync::Arc;
-use rustc_serialize::hex::FromHex;
+use rustc_hex::FromHex;
 use fetch::{Client as FetchClient, Fetch};
 use hash_fetch::urlhint::{URLHintContract, URLHint, URLHintResult};
 use parity_reactor::Remote;

dapps/src/lib.rs

@@ -24,7 +24,7 @@ extern crate futures;
 extern crate linked_hash_map;
 extern crate mime_guess;
 extern crate rand;
-extern crate rustc_serialize;
+extern crate rustc_hex;
 extern crate serde;
 extern crate serde_json;
 extern crate time;

dapps/src/tests/fetch.rs

@@ -15,7 +15,7 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 use devtools::http_client;
-use rustc_serialize::hex::FromHex;
+use rustc_hex::FromHex;
 use tests::helpers::{
 	serve_with_registrar, serve_with_registrar_and_sync, serve_with_fetch,
 	serve_with_registrar_and_fetch, serve_with_registrar_and_fetch_and_threads,

dapps/src/tests/helpers/registrar.rs

@@ -17,7 +17,7 @@
 use std::str;
 use std::sync::Arc;
 use std::collections::HashMap;
-use rustc_serialize::hex::FromHex;
+use rustc_hex::FromHex;
 
 use hash_fetch::urlhint::ContractClient;
 use util::{Bytes, Address, Mutex, H256, ToPretty};