message: testnet - enable USDT
diff: }
  ]
  },
  + "BTC-USDT": {
  + "active": true,
  + "buy": true,
  + "sell": true,
  + "type": "coin",
  + "orders": [
  + {
  + "amount": 0.001,
  + "spreadBuy": 4,
  + "spreadSell": 4
  + },
  + {
  + "amount": 0.005,
  + "spreadBuy": 4,
  + "spreadSell": 4
  + },
  + {
  + "amount": 0.01,
  + "spreadBuy": 5,
  + "spreadSell": 5
  + },
  + {
  + "amount": 0.05,
  + "spreadBuy": 5,
  + "spreadSell": 5
  + },
  + {
  + "amount": 0.25,
  + "spreadBuy": 2,
  + "spreadSell": 2
  + }
  + ]
  + },
  "USDT-BTC": {
  "active": true,
  "buy": true,
  