title: python-binance api invalid symbol only for certain pairs
body: <p>I am testing pairs from <a href="https://api.binance.com/api/v3/exchangeInfo" rel="nofollow noreferrer">https://api.binance.com/api/v3/exchangeInfo</a>
  there seems to be no rhyme or reason to the symbols that work or don't work.</p>
  <p><code>print(Client.get_ticker(symbol='BTCUSDT'))</code>
  works
  <code>print(Client.get_ticker(symbol='LTCBTC'))</code>
  works
  <code>print(Client.get_ticker(symbol='ETHBTC'))</code>
  works
  <code>print(Client.get_ticker(symbol='NEOBTC'))</code>
  <code>APIError(code=-1121): Invalid symbol</code>
  <code>print(Client.get_ticker(symbol='MATICUSDT'))</code>
  <code>APIError(code=-1121): Invalid symbol</code>
  <code>print(Client.get_ticker(symbol='ADAUSDT'))</code>
  <code>APIError(code=-1121): Invalid symbol</code></p>
  <p>Why is this happening and how do I fix it?</p>