remove constructor because using proxy mode clone

contracts/lib/InitializableOwnable.sol

@@ -0,0 +1,48 @@
+/*
+
+    Copyright 2020 DODO ZOO.
+    SPDX-License-Identifier: Apache-2.0
+
+*/
+
+pragma solidity 0.6.9;
+pragma experimental ABIEncoderV2;
+
+/**
+ * @title Ownable
+ * @author DODO Breeder
+ *
+ * @notice Ownership related functions
+ */
+contract InitializableOwnable {
+    address public _OWNER_;
+    address public _NEW_OWNER_;
+
+    // ============ Events ============
+
+    event OwnershipTransferPrepared(address indexed previousOwner, address indexed newOwner);
+
+    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
+
+    // ============ Modifiers ============
+
+    modifier onlyOwner() {
+        require(msg.sender == _OWNER_, "NOT_OWNER");
+        _;
+    }
+
+    // ============ Functions ============
+
+    function transferOwnership(address newOwner) external onlyOwner {
+        require(newOwner != address(0), "INVALID_OWNER");
+        emit OwnershipTransferPrepared(_OWNER_, newOwner);
+        _NEW_OWNER_ = newOwner;
+    }
+
+    function claimOwnership() external {
+        require(msg.sender == _NEW_OWNER_, "INVALID_CLAIM");
+        emit OwnershipTransferred(_OWNER_, _NEW_OWNER_);
+        _OWNER_ = _NEW_OWNER_;
+        _NEW_OWNER_ = address(0);
+    }
+}