Fix compile error, minor nits

tests/eth1_test_rig/Cargo.toml

@@ -9,6 +9,5 @@ web3 = "0.8.0"
 tokio = "0.1.17"
 futures = "0.1.25"
 types = { path = "../../eth2/types"}
-eth2_ssz = { path = "../../eth2/utils/ssz"}
 serde_json = "1.0"
 deposit_contract = { path = "../../eth2/utils/deposit_contract"}

tests/eth1_test_rig/src/lib.rs

@@ -10,7 +10,6 @@ mod ganache;
 use deposit_contract::{eth1_tx_data, ABI, BYTECODE, CONTRACT_DEPLOY_GAS, DEPOSIT_GAS};
 use futures::{stream, Future, IntoFuture, Stream};
 use ganache::GanacheInstance;
-use ssz::Encode;
 use std::time::{Duration, Instant};
 use tokio::{runtime::Runtime, timer::Delay};
 use types::DepositData;