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

json/src/bytes.rs

@@ -19,7 +19,7 @@
 use std::fmt;
 use std::str::FromStr;
 use std::ops::Deref;
-use rustc_serialize::hex::FromHex;
+use rustc_hex::FromHex;
 use serde::{Deserialize, Deserializer};
 use serde::de::{Error, Visitor};
 

json/src/hash.rs

@@ -20,7 +20,7 @@ use std::str::FromStr;
 use std::fmt;
 use serde::{Deserialize, Deserializer, Serialize, Serializer};
 use serde::de::{Error, Visitor};
-use rustc_serialize::hex::ToHex;
+use rustc_hex::ToHex;
 use util::hash::{H64 as Hash64, H160 as Hash160, H256 as Hash256, H520 as Hash520, H2048 as Hash2048};
 
 

json/src/lib.rs

@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
-extern crate rustc_serialize;
+extern crate rustc_hex;
 extern crate serde;
 extern crate serde_json;
 extern crate ethcore_util as util;