trade incentive fix && test

contracts/lib/FeeRateModelLogicUpdate.sol

@@ -1,28 +0,0 @@
-/*
-
-    Copyright 2020 DODO ZOO.
-    SPDX-License-Identifier: Apache-2.0
-
-*/
-
-pragma solidity 0.6.9;
-pragma experimental ABIEncoderV2;
-
-import {ReentrancyGuard} from "../lib/ReentrancyGuard.sol";
-import {InitializableOwnable} from "../lib/InitializableOwnable.sol";
-
-//for test update
-contract FeeRateModelLogicUpdate is ReentrancyGuard ,InitializableOwnable{
-    //DEFAULT
-    uint256 public _FEE_RATE_;
-    mapping(address => uint256) feeMapping;
-
-    function setSpecificFeeRate(address trader, uint256 feeRate) external onlyOwner {
-        require(trader != address(0), "INVALID ADDRESS!");
-        feeMapping[trader] = 0;
-    }
-
-    function setFeeRate(uint256 newFeeRate) external onlyOwner {
-       _FEE_RATE_ = _FEE_RATE_+ newFeeRate;
-    }
-}