convert BreakInvariantBounty to initializers

contracts/drafts/BreakInvariantBounty.sol

 pragma solidity ^0.4.24;
 
 
+import "../Initializable.sol";
 import "../payment/PullPayment.sol";
 import "../ownership/Ownable.sol";
 
@@ -9,12 +10,17 @@ import "../ownership/Ownable.sol";
  * @title BreakInvariantBounty
  * @dev This bounty will pay out to a researcher if they break invariant logic of the contract.
  */
-contract BreakInvariantBounty is PullPayment, Ownable {
+contract BreakInvariantBounty is Initializable, PullPayment, Ownable {
   bool private _claimed;
   mapping(address => address) private _researchers;
 
   event TargetCreated(address createdAddress);
 
+  function initialize() public initializer {
+    PullPayment.initialize();
+    Ownable.initialize();
+  }
+
   /**
    * @dev Fallback function allowing the contract to receive funds, if they haven't already been claimed.
    */

contracts/mocks/BreakInvariantBountyMock.sol

@@ -4,9 +4,10 @@ pragma solidity ^0.4.24;
 // See: https://github.com/ethereum/solidity/issues/4871
 // solium-disable-next-line max-len
 import {BreakInvariantBounty, Target} from "../drafts/BreakInvariantBounty.sol";
+import "../Initializable.sol";
 
 
-contract TargetMock is Target {
+contract TargetMock is Initializable, Target {
   bool private exploited;
 
   function exploitVulnerability() public {
@@ -22,7 +23,11 @@ contract TargetMock is Target {
   }
 }
 
-contract BreakInvariantBountyMock is BreakInvariantBounty {
+contract BreakInvariantBountyMock is Initializable, BreakInvariantBounty {
+  constructor() public {
+    BreakInvariantBounty.initialize();
+  }
+
   function _deployContract() internal returns (address) {
     return new TargetMock();
   }