Remove unused

Author: NIC619

contracts/SignalBuyContract.sol

@@ -9,8 +9,6 @@ import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
 import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
 
 import "./interfaces/ISignalBuyContract.sol";
-import "./interfaces/IPermanentStorage.sol";
-import "./interfaces/ISpender.sol";
 import "./interfaces/IWeth.sol";
 import "./utils/BaseLibEIP712.sol";
 import "./utils/LibConstant.sol";

contracts/interfaces/ISignalBuyContract.sol

@@ -2,8 +2,6 @@
 pragma solidity >=0.7.0;
 pragma abicoder v2;
 
-import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
-
 import "../utils/SignalBuyContractLibEIP712.sol";
 
 /// @title ISignalBuyContract Interface