SUBSCRIBE_EVENT: subscribe:mini_ticker
UNSUBSCRIBE_EVENT: unsubscribe:mini_ticker
DATA: ['BTCUSDT', 'ETHUSDT'] or 'BTCUSDT' or 'all'
LISTEN_EVENT: spot:mini_ticker:update
{
b: "AXS", // base asset
h: 1145085, // high
l: 675136, // low
ld: 708142, // last 24h price
p: 1049701, // last price
q: "VNDC", // quote asset
s: "AXSVNDC", // symbol
u: true, // price is up/down
vb: 45507394.71000066, // volume of base asset
vq: 40143077109714.71, // volume of quote asset
}