Add [Historical Swap Records Chart] in steem2bts

Despite that steem2bts isn't that popular I still added the chart for completeness.

The popularity is linear to the popular of the coin XXX in steem2XXX.

The bitshare price declines a lot in the past year and I am making a loss because at the time of developing the tool, I topped up the BTS worth of 500 USD now it is worth about 88 USD.

BTS is less popular/valuable than STEEM, so I don't expect much interests in conversion from STEEM to BTS.

However, I'll keep the tool running as much as I can.

Steem to the Moon🚀!

• You can rent Steem Power via rentsp!
• You can swap the STEEM/SBD to SOL Solana via steem2sol!
• You can swap the STEEM/SBD to ETH Ethereum via steem2eth!
• You can swap the STEEM/SBD to Tether USDT (TRC-20) via steem2usdt!
• You can swap the STEEM/SBD to TRX (TRON) via steem2trx!
• You can swap the STEEM/SBD to BTS (BitShares) via steem2bts!
• Register a free STEEM account at SteemYY!
• Steem Block Explorer
• ChatGPT/Steem Integration: You can type !ask command to invoke ChatGPT
• Steem Witness Table and API
• Other Steem Tools