8.21.0

• Feature: Support for the following new recurring transactions:
  CreatePlan, UpdatePlan
• Feature: Support for the following new gift card transactions:
  Activate, Deactivate, Load, Unload, Balance Inquiry
• Feature: Gift card responses are now returned as part of
  authorzationResponse, authReversalResponse, captureResponse,
  forceCapture, captureGivenAuthResponse, saleResponse, creditResponse
• Feature: fraudResult is now returned as part of captureResponse,
  forceCaptureResponse, captureGivenAuthResponse, creditResponse