message: fix utils import issue
diff: import { BaseToken, Web3SideChainClient } from "../model";
  -import BN from "bn.js";
  -import { ITransactionConfig, ITransactionOption } from "../interfaces";
  -import { formatAmount, IEventBusPromise, eventBusPromise, merge } from "../utils";
  -import { createTransactionConfig } from "../utils/create_tx_config";
  +import { ITransactionOption } from "../interfaces";
  import { DepositManager } from "./deposit_manager";
  export class ERC721 extends BaseToken {
  @@ -34,13 +31,7 @@ export class ERC721 extends BaseToken {
  userAddress
  );
  - return createTransactionConfig(
  - {
  - txConfig: {},
  - defaultTxConfig: this.childDefaultConfig,
  - }).then(config => {
  - return method.read<string>(config);
  - });
  + return this.processRead<number>(method, options);
  }
  /**
  @@ -59,13 +50,7 @@ export class ERC721 extends BaseToken {
  index
  );
  - return createTransactionConfig(
  - {
  - txConfig: {},
  - defaultTxConfig: this.childDefaultConfig,
  - }).then(config => {
  - return method.read<string>(config);
  - });
  + return this.processRead(method, options);
  }
  /**
  