title: how to place a stop-buy order by ccxt in binance
body: <p>I try to do that by codes below but I got error</p>
  <pre><code>import ccxt  # noqa: E402
  import apiConfig
  
  exchange = ccxt.binance({
      'apiKey': apiConfig.API_KEY,
      'secret': apiConfig.API_SECRET,
      'enableRateLimit': True,
  })
  
  symbol = 'RVN/USDT'
  
  type = 'limit'  # or 'market', other types aren't unified yet
  side = 'buy'
  amount = 69  # your amount
  price = 0.21  # your price
  # overrides
  params = {
      'stopPrice': 0.20,  # your stop price
      'type': 'stopLimit',
  }
  order = exchange.create_order(symbol, type, side, amount, price, params)
  </code></pre>
  <p>I got this error:
  ccxt.base.errors.BadRequest: binance {&quot;code&quot;:-1106,&quot;msg&quot;:&quot;Parameter 'stopPrice' sent when not required.&quot;}</p>