Coinex cancelOrder
Coinex cancelOrder

Added margin functionality to cancelOrder:
```
node examples/js/cli coinex cancelOrder 77968983162 BTC/USDT '{"account_id":"1"}'

coinex.cancelOrder (77968983162, BTC/USDT, [object Object])
2022-06-02T02:17:02.034Z iteration 0 passed in 330 ms

{
  id: '77968983162',
  clientOrderId: undefined,
  datetime: '2022-06-02T02:12:30.000Z',
  timestamp: 1654135950000,
  lastTradeTimestamp: undefined,
  status: 'open',
  symbol: 'BTC/USDT',
  type: 'limit',
  timeInForce: undefined,
  postOnly: undefined,
  reduceOnly: undefined,
  side: 'sell',
  price: 35000,
  stopPrice: undefined,
  cost: 0,
  average: undefined,
  amount: 0.0005,
  filled: 0,
  remaining: 0.0005,
  trades: [],
  fee: { currency: 'USDT', cost: 0 },
  info: {
    amount: '0.0005',
    asset_fee: '0',
    avg_price: '0.00',
    client_id: '',
    create_time: '1654135950',
    deal_amount: '0',
    deal_fee: '0',
    deal_money: '0',
    fee_asset: null,
    fee_discount: '1',
    finished_time: '0',
    id: '77968983162',
    left: '0.0005',
    maker_fee_rate: '0.002',
    market: 'BTCUSDT',
    money_fee: '0',
    order_type: 'limit',
    price: '35000.00',
    status: 'not_deal',
    stock_fee: '0',
    taker_fee_rate: '0.002',
    type: 'sell'
  },
  fees: [ { currency: 'USDT', cost: 0 } ]
}
```

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