message: Add hbar to coinbuildermap
  Need to be able to instantiate an hbar builder with the getBuilder
  helper utility - this commit adds it to the map that allows us to do so
  Ticket:
diff: @@ -41,6 +41,8 @@ const coinBuilderMap = {
  trbtc: Rbtc.TransactionBuilder,
  celo: Celo.TransactionBuilder,
  tcelo: Celo.TransactionBuilder,
  + hbar: Hbar.TransactionBuilderFactory,
  + thbar: Hbar.TransactionBuilderFactory,
  };
  /**
  