Mexc cancelOrder
Mexc cancelOrder

Added functionality for swap and stop orders to cancelOrder:

Spot:
```
node examples/js/cli mexc cancelOrder "'7b762176d81b4d079cd1105ebdc18809'" BTC/USDT

mexc.cancelOrder (7b762176d81b4d079cd1105ebdc18809, BTC/USDT)
2022-04-12T06:33:04.938Z iteration 0 passed in 224 ms

{
  id: '7b762176d81b4d079cd1105ebdc18809',
  clientOrderId: undefined,
  timestamp: undefined,
  datetime: undefined,
  lastTradeTimestamp: undefined,
  status: undefined,
  symbol: 'BTC/USDT',
  type: undefined,
  timeInForce: undefined,
  side: undefined,
  price: undefined,
  stopPrice: undefined,
  average: undefined,
  amount: undefined,
  cost: undefined,
  filled: undefined,
  remaining: undefined,
  fee: undefined,
  trades: [],
  info: { '7b762176d81b4d079cd1105ebdc18809': 'success' },
  fees: []
}
```

Swap:
```
node examples/js/cli mexc cancelOrder "'268749627367448068'" BTC/USDT:USDT

mexc.cancelOrder (268749627367448068, BTC/USDT:USDT)
2022-04-12T06:35:54.240Z iteration 0 passed in 270 ms

{
  id: '0',
  clientOrderId: undefined,
  timestamp: undefined,
  datetime: undefined,
  lastTradeTimestamp: undefined,
  status: undefined,
  symbol: 'BTC/USDT:USDT',
  type: undefined,
  timeInForce: undefined,
  side: undefined,
  price: undefined,
  stopPrice: undefined,
  average: undefined,
  amount: undefined,
  cost: undefined,
  filled: undefined,
  remaining: undefined,
  fee: undefined,
  trades: [],
  info: [
    {
      orderId: '268749627367448068',
      errorCode: '0',
      errorMsg: 'success'
    }
  ],
  fees: []
}
```

Stop:
```
node examples/js/cli mexc cancelOrder "'268750063931572736'" BTC/USDT:USDT '{"stop":"true"}'

mexc.cancelOrder (268750063931572736, BTC/USDT:USDT, [object Object])
2022-04-12T06:37:28.075Z iteration 0 passed in 268 ms

{
  id: undefined,
  clientOrderId: undefined,
  timestamp: undefined,
  datetime: undefined,
  lastTradeTimestamp: undefined,
  status: undefined,
  symbol: 'BTC/USDT:USDT',
  type: undefined,
  timeInForce: undefined,
  side: undefined,
  price: undefined,
  stopPrice: undefined,
  average: undefined,
  amount: undefined,
  cost: undefined,
  filled: undefined,
  remaining: undefined,
  fee: undefined,
  trades: [],
  info: [],
  fees: []
}
```

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