@hivefinex include 'swap' in the memo to get SWAP.HIVE

While I made this feature before, but never explained it, since I'll discontinue @hivefinex on 2020-06-20.

Yet still some people seem to be confused: if they send HIVE to @hivefinex, they'll get SWAP.HIVE, which is not.

By default, you'll get HIVEP on SE. (Again, please check carefully before making inqueries. No answer means you got it already.)

To get SWAP.HIVE on HE, you should include 'swap' in the memo.