Update dependencies and bigint api (#5685)

* update to latest bigint

* bump elastic array and deps

* fix rlp tests

* also update all smallvec deps

* fix doc test

* reduce parking in attempt to fix CI bug

* fix from/into electum bug

* remove duplicate imports

util/bigint/Cargo.toml

@@ -8,9 +8,9 @@ version = "0.1.3"
 authors = ["Parity Technologies <admin@parity.io>"]
 
 [dependencies]
-bigint = "1.0.4"
+bigint = "2.0"
 rustc-serialize = "0.3"
-heapsize = "0.3"
+heapsize = "0.4"
 rand = "0.3.12"
 libc = "0.2"
 

util/bigint/src/hash.rs

@@ -17,7 +17,7 @@ use std::str::FromStr;
 use rand::Rng;
 use rand::os::OsRng;
 use rustc_serialize::hex::{FromHex, FromHexError};
-use bigint::{Uint, U256};
+use bigint::U256;
 use libc::{c_void, memcmp};
 
 /// Return `s` without the `0x` at the beginning of it, if any.