message: Add cancel subject line
diff: @@ -96,8 +96,11 @@ export const CancelPremium: React.FC<CancelPremiumProps & BoxProps> = ({
  If you're cancelling your Premium membership, you'll lose access
  to all of your premium features and won't be able to add any more
  blocks. <strong>Note:</strong> If you're cancelling for financial
  - reasons, please <a href="mailto:help@are.na">contact us</a> and
  - we'll work with you.
  + reasons, please{' '}
  + <a href="mailto:help@are.na?subject=Premium account financial assistance">
  + contact us
  + </a>{' '}
  + and we'll work with you.
  </Text>
  <ButtonContainer>
  <Button
  