message: Fix a typo in BUcash 1.1.1.1 rel notes
diff: Release Notes for Bitcoin Unlimited Cash Edition 1.1.1.1
  =========================================================
  -Bitcoin Unlimited Cash Edition version 1.1.1.0 is now available from:
  +Bitcoin Unlimited Cash Edition version 1.1.1.1 is now available from:
  <https://bitcoinunlimited.info/download>
  